pdf method

HI I need help with the PDF method Some websites upload your PDF, but don't show where it's uploaded. How to find it? As I remember 10 - 12 years ago, there was a firefox extension, it was called htttp header or soething like , i was using it to track where files uploaded in upload forms...

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...

Might be a stupid question but if I'm using the pdf method to rank in google does it matter if my domain is only a couple of weeks old?