Why you want PDF Submitter software?
I will suggest you, you should be submit pdf manually because there many benefit here:-
1) Create user id and password different - different user maintain in excel
2) Find file hosting site Google, you can find easy
3) Tagging with keyword and put description
4) Promote url of upload file with facebook or social networking site
I think that's really helpful for you.
You can check out RankWhiz or the one by the same guy who owns SEO Link Robot (can't remember the name right now, something like doc submit robot--but I don't think that's right lol). RankWhiz looks pretty interesting, been on the fence about getting it for a while. Might find a better price than what's listed on the site if you search around with Google.
http://www.rankwhizz.com
http://www.warriorforum.com/warrior-special-offers-forum/542165-unique-software-set-forget-ranking-traffic-autopilot-lifetime-licence-available.html
http://docmarketingrobot.com/
http://docmarketingrobot.com/freeversion/
You were close..that other app you're referring to is called:
'SEO Link Robot Fast Indexer'...it's free to!
Just search for that term and you'll find the appropriate website in question!
20 Best Free File Hosting Sites here:-Do you have a list of hostin sites?
So is Rank Whizz better than Document Marketing Robot?