There are 2 main links I will give here :
1. ONLINE SHA1 Collider :
Create your own PDFs online that would have the same SHA1 hashes by uploading a couple of JPGs of your choice (each should be smaller than 64 kB in size).
Link :
Code:
https://alf.nu/SHA1
2. Create the PDFs with the same SHA1 sigs
OFFLINE by using the PYTHON script that can be found at this
LINK .
Direct Download:
Code:
https://github.com/nneonneo/sha1collider/archive/master.zip