For whatever it is worth, if you go to sites that report on other sites web traffic and basic data you can get some info about most websites... This one, Hypestat says this about Payposter:
"payposter.com receives about 600 unique visitors and 1,200 (2.00 per visitor) page views per day which should earn about $4.80/day from advertising revenue. Estimated site value is $2,322.41. According to Alexa Traffic Rank payposter.com is ranked number 582,909 in the world and 0.00012% of global Internet users visit it. Site is hosted in West Chicago, IL, 60185, United States and links to network IP address 74.122.199.117."
But they are noting a U.S. hosting site in Chicago...
Other site sites that check into site data or scam sites are listing these guys as having origins either in Ukraine or Pakistan, and note "owner data hidden"...
My guess is they are not located in Chicago... Even though these check up sites are notoriously inaccurate and easy to dupe, if you look at the overlapping info, it paints a picture of a site that doesn't actually sell much, if anything and does not have much traffic, and is probably located in areas renowned for shenanigans...
Best Advice... Don't go there, just sign the petition, spread the word about the viruses and phishing and hope lack of traffic makes them close it down on their own... If they are located in either Ukraine or Pakistan, there isn't a lot that will get them shut down unless they somehow offend Coke or Apple or some other big dog.
Even if they are shut down, they will just reopen under a different name... They were temporarily shutdown for linking to porn images of minors... If they came back from that, what is a little phishing scam compared to that?