In the last few months we’ve been tracking a common technique being used by attackers: They hack a web site and use that as part of their link farm to build page rank for them on search engines. We posted many articles about similar spam issues in the past.
Recently, we’ve started to notice a lot of government web sites from Brazil in this list.
Some are fairly big sites:
http://www.ibama.gov.br – Environmental Ministry
http://www4.planalto.gov.br – Old Presidential Web site
http://www.inmetro.gov.br – Quality control ministry
http://www.cnen.gov.br – Nuclear Energy Commission
http://www.fazenda.sp.gov.br – Treasury from the state of Sao Paulo
http://inpa.gov.br – Amazon research institute
http://www.jfal.gov.br/ – Alagoas Federal Justice
The list goes on and on. These sites have been hacked and the attackers added links to buy Viagra, “Cialis” and other spam on them. In fact if you search on Google for “viagra” on the .br sites you will see all of them:
I think you get the drift with all the references to Inmetro, Ibama, Eletrosul, etc. What’s more scary than the SPAM itself, is that these sites are hacked and nobody is noticing it or taking any action to clean them up. Some of them are even blacklisted by Google and serving malware (like the fazenda.sp.gov.br/noticias/fazenda/):
Even the old Presidential web site (planalto.gov.br) is full of SPAM on it:
If you’re interested in researching more infected sites, do a Google search for “viagra soft” inurl:.gov.br or “cialis” inurl:.gov.br. It’s very easy to spot, and it’s a shame that no one is doing anything to take back control of their web properties. Our scanner can also easily identify these:
We’re continuing our research and will update as soon as we have a clearer picture of the scale of infected sites.
If your site has been hacked (or has spam / malware), and you need help, send us an email to email@example.com or visit our site: Sucuri Security. We can get it cleaned up right away.
Also, consider checking out our site security monitoring. We will monitor your sites 24×7 and alert you if it ever gets infected with malware, hacked or blacklisted.