Blacklisted :
http://www.urlvoid.com/scan/arbitragem.com.br/?url=arbitragem.com.br
https://sitecheck.sucuri.net/results/arbitragem.com.br
https://www.virustotal.com/en/url/1682fb443aae580173fad6e24790dabfac3af075c0a3cb08ce9440e8df257071/analysis/1487062877/
https://www.virustotal.com/en/ip-address/108.179.192.217/information/

Check if one (or more) of the links are blacklisted :
https://www.websicherheit.at/website-malware-viren-scanner/?url=arbitragem.com.br

Vulnerable library used :
http://retire.insecurity.today/#!/scan/a5ad1cb2c7febe9f4e140d0b3d4df0ee5dac8e17a3f12654cecb9c8826ad342b