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If you're not comfortable with the method 1, then this method would be your best choice. PassCue for PDF is a powerful PDF password cracking tool that makes it easy to recover PDF user and owner passwords and remove restrictions on printing, copying and editing. The PDF password cracking tool supports batch removal of PDF file passwords, and has multiple password decryption methods, which can easily crack long and complicated passwords. It has multiple decryption methods, including brute force decryption, mask decryption, dictionary decryption and key search decryption. The program can be able to crack up to 7-bit file passwords in less than a hour. The software's multi-threaded code is optimized for modern multi-core PCs, ensuring optimal performance and fastest password recovery. It has small size, fast running speed, independent operation.
Now you should know that Adobe offers two types of PDF encryption: Open password and Owner password. Unauthorized users do not have permission to open PDF files and access data. At the same time, Owner password is used to restrict users from printing, copying and editing PDF files. Regardless of which PDF password you have forgotten, PassCue for PDF can easily crack your PDF document password.
We learned most of the basic information on John the Ripper in our Previous Article which can be found here. In this article, we will use John the Ripper to crack the password hashes of some of the file formats like zip, rar, pdf and much more.
To crack these password hashes, we are going to use some of the inbuilt and some other utilities which extract the password hash from the locked file. There are some utilities that come inbuilt with John which can be found using the following command.
John the Ripper can crack the PDF file passwords. You can encrypt your pdf online by using this website. This will compress and encrypt our pdf into a password protected file.pdf. So, when you will try to open the file, you will be greeted by the following prompt.
John the Ripper is the name of the password cracker tool that is developed by Openwall. As the name, It is used to crack password hashes by using its most popular inbuilt program, rules and codes that are also an individual password cracker itself in a single package.
Dictionary attack: This is the popular and most usable attack in the JTR (John the Ripper) password cracker tool where we used pre-defined words or a list of words that can be used to crack the password. This attack uses the words from the wordlist (A text file having pre-defined words) and matches every single word from the list with a password to crack in sequence.
Brute-force attack: If you are using this attack then you have to do the configuration of few things before its use such as the defining minimum and maximum lengths of the password, defining possible characters that you want to test during the cracking process like (special characters, alphabets and numbers).
For Example, The matching string that you are using for cracking passwords should include uppercase alphabets, special characters and numbers like ABC32@$The user gets a password on the successful match, but this effective process is slow. for example, a 10-character password including upper and lower letters along with numbers and special characters will take over 10 years to be guessed by a computer,
Using this password cracker tool is very easy and straightforward, you just need to type john followed by the hash file that you want to crack and then just define the format of the hash and hit enter.
Now in this section, we will learn practically how to use john the ripper password cracker to crack password-protected zip, rar, hash, MD5 and SHA1 files, also we will see how to crack Linux passwords of all users.
Step 2) Now as we know JTR use hash to crack password, so we first need to generate a hash of our zip file. The below command will generate a hash of our techofide.zip file and store that generated hash value into a hash.txt file
Step 3) Let's break it with our tool, So now we have a hash of our zip file that we will use to crack the password. In the below command we use the format option to specify the zip file and then the hash.txt file where we store our hash value.
Step 1) In this example I am generating a hash by using md5 hash generator to show you how to crack MD5 formatted files password. In the below image you can see I have generated the hash of the 12345 string. You can copy the MD5 hash to perform the same practical
In one event we saw the adversary compromise a Linux-system through SSH. The user account was possibly compromised on the Linux server by using credential stuffing or password spraying: Logfiles on the Linux-system show traces which can be attributed to a credential stuffing or password spraying attack.
According to the official website, Cain & Abel is a password recovery tool for Microsoft Operating Systems. It allows easy recovery of various kinds of passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, recovering wireless network keys, revealing password boxes, uncovering cached passwords and analyzing routing protocols.
Other prominent delivery methods and infection pathways have involved the use of password-protected ZIP files containing an ISO file, mirroring that of Qakbot, with the payload propagated through a pay-per-installer service known as PrivateLoader, according to Team Cymru.
It is one of the most popular password testing and breaking programs as it combines a number of password crackers into one package, autodetects password hash types,MD5, and includes a customizable cracker.John the Ripper can use is the dictionary attack and also offers a brute force mode. It takes text string samples (usually from a text file, called a wordlist, containing words found in a dictionary or real passwords cracked before), encrypting it in the same format as the password being examined (including both the encryption algorithm and key), and comparing the output to the encrypted string.
From the image, we will crack the password for users johndoe and Karen. Since password cracking can be, at times, a lengthy process for complex passwords, we set the username as the password. We will copy the whole field and save it in a file with a name shadow.hashes on the Desktop. To crack the password hash, we will use the syntax below:
Now, we will copy the password hash in the /etc/shadow directory and store it in the file hashes.txt. To crack this password hash using a wordlist, we will use the --wordlist parameter then provide the path of the wordlist.
When using a wordlist to crack password hashes, you can set rules to mangle the words in the wordlist to try variations of that word. For example, if we have a word like johndoe, JtR will add numbers to the end of the word and try replacing letters with numbers and adding other random symbols. The resulting output might include:
To crack a zip file, we first need to extract the password hash then crack it with John the Ripper. To extract zip file password hashes, we will use a tool called zip2john. If we were working with a rare file, we would use the tool rar2john to extract the hashes.
Even though there are many password-cracking utilities available today, John the Ripper is with no doubt one of the best and most reliable. It has been used with other tools in most Cyber Attack Conferences to exploit the vulnerability of a system of elevated privileges on a compromised system. I believe this tutorial has given you a clear guide on how to get started with password cracking using JtR.
JohnTheRipper, as mentioned at the beginning of the article is not related by itself to PDF´s, but to passwords and security stuff. That's why you will need to create the hash file of the PDF using the pdf2john.pl tool (available in the run directory after compiling from source). This tool allows you to obtain the hash (Read meta information) of the file through this perl script, which can be extracted into a new file with the following command:
This will use UTF-8 as the default input encoding and will start to guess the password of the PDF file using the default wordlist of the library. If it's found, it will display the password and the path to the protected PDF:
If you try to run the command on the same file after the password has been guessed, you will see the following messages: "No password hashes loaded", "No password hashes loaded", or "No password hashes left to crack (see FAQ)". Cracked passwords will be printed to the terminal and saved in the file called $JOHN/john.pot (in the documentation and in the configuration file for John, "$JOHN" refers to John's "home directory"; which directory it really is depends on how you installed John). The $JOHN/john.pot file is also used to not load password hashes that you already cracked when you run John the next time.
WPA/WPA2 cracking technique: Our devices have wireless passwords stored so that we do not enter the password on the same device again and again. The attackers take advantage of this by forcefully de-authenticating all the devices on the network. The devices will try to auto-connect to the access point by completing the 4-way handshake. This handshake is recorded and has the hashed password. The hashed password can be brute-forced by using a rainbow table.
Cain & Abel is one of the most popular tools that is used for password cracking. The tool is able to sniff the network, crack encrypted passwords using various password cracking techniques, and perform cryptanalysis attacks. It can also discover wireless keys by analyzing wireless protocols.
WepAttack can be used to crack 802.11 WEP Keys using a dictionary-based approach. The tool can capture the network dump file received from pcap or libpcap etc. The tool is open source and supports the Linux platform. One thing to be noted here is that the attack is active and not passive in nature. The tool will just test the dictionary words to get the working key. The key requirement for this is a working LAN card. 2b1af7f3a8