PDF Password Cracking Using JTR

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Today we are going learn how to crack the password of PDF file using JTR(John The Ripper) tool. 

Disclaimer: The articles provided on HackWithV is purely for informational and educational purpose only, and for those who are willing and curious to know & learn about Ethical Hacking, Security and Penetration Testing. Anytime the word "Hacking" that is used on this site shall be regarded as Ethical Hacking.

What is PDF?

  • PDF stands for the Portable Document Format, used to display documents in an electronic form independent of the software, hardware or operating system they are viewed on.

What is JTR?

  • John, better known as John the Ripper, is a tool to find weak passwords of users in a server.
  • John supports different cracking modes and understands many ciphertext formats, like several DES variants, MD5 and blowfish. 
  • It can also be used to extract AFS and Windows NT passwords.

Practical:

  • Attacker: Kali Linux(OS), John(Tool), Wordlist.
  • Target: PDF(file)

 ls

  • Here we have pdf2john(hashextractor), sample.pdf(target PDF file), rockyou.txt(wordlist). Now lets extract the hashes of PDF file.
 ./pdf2john sample.pdf

  • The pdf2john has extracted the hashes of the PDF. Copy the hash in a file.
 cat hash.txt

  • Here the hash is saved in a file. Now check usage of john.
  john --help


 
 

  • Now, its time for crack the password using john, hash.txt file and rockyou.txt file.
  • The rockyou.txt file contains 14344394 password.
  • The john cracked the password within 2 min 10 sec.
 wc -l rockyou.txt

 john hash.txt --wordlist=rockyou.txt


  • Here we got the password of PDF, now try open the pdf with this password.

Be Aware, Be Secure.

Thank You 🙏

 

I'm a Cyber Security professional with expertise in Network, Application, Endpoint, Cloud Security, DevOps, and IT Ops. I have experience in various industries and am well-versed in relevant regulations and standards. My goal is to provide exceptional security solutions that protect organizations from evolving threats, while also streamlining workflows and improving collaboration between development, operations, and security teams through DevOps and IT Ops practices.

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