pdf index

Hi guys! In this niche i'm untill 2018', but I take a pause for a year, because was engaged in other things. ;) Recently I decided to check, how is the pdf doorways in Google now. I was surprised to see a lot of it on the sites like...

How i make pdf like this https://members.narst.org/global_engine/download_custom.aspx?fileid=f8d39bcb-7dd1-4bab-8d36-c138d5aec974.pdf&filename=cP1-K.pdf&blnIsPublic=2&code=blog&sub=add

Hello BHW members! I'm looking for a way to index a pdf. I saw a lot of "Game Generators" pdf. classified on the first google page indexed in minutes. Does anyone have any idea how to do this?

Hello blackhatworld members, I opened this topic because for 2 weeks I have been struggling to index pdf files in google. Uploading the pdf file is easy and I think everyone here knows that, but the problem comes with indexing, reading here on the forum I understood that if it is not indexed in...

Hello! I want to find a way to index a pdf posted on a .edu or .gov site I searched a lot but I didn't find anything .. if you have a tool, a tip or a method you can leave it here please