I strongly suspect "Free PDF to JPG Converter 2015" of being malware.
- There's no source code to download
- Only 1 .exe file.
- New project
- Very keyword-heavy summary
- It's Windows only and being spammed on Ask Ubuntu.
- It's not a question. It's not even close.
These are only suspicions but if it is malware, that would explain why they're spamming it around. Malware earns its creators money by doing various illicit things. That said, you really don't need to get this intimate with this questionthis question. It fails the "is it a question" test even before you try to work out if it's spam. It needs to burn.
With regard to your rejected flag, occasionally linking directly to an application or script is a valid option though, especially if the question requests it. Solicited relevant posts are fine (even ones that are self-promotion) as long as that self-interest is disclosed.
There are also times when we'll reject spam flags because it's not spammy enough. An accepted spam flag has network-wide ramifications for users so we occasionally let self-promoting users off with a warning.