Suspicious script and browser difference : https://www.websicherheit.at/website-malware-viren-scanner/?url=birthdaywisheszone.com
6 months ago only on 1 blacklist, now on 3 : http://www.urlvoid.com/scan/birthdaywisheszone.com/
Bad IP history : https://www.virustotal.com/en/ip-address/104.27.189.77/information/
Blacklistings on that ASN : http://urlquery.net/report.php?id=1481104075347
Suspicious : https://quttera.com/detailed_report/birthdaywisheszone.com
Invalid SSL response : http://zulu.zscaler.com/submission/show/c069e0e1696a53a7d67ac2737990c3f4-1481104058
Vulnerable library used : http://retire.insecurity.today/#!/scan/9952d3206b8ec83b847cd357713291cee78cefb4e1b9ebb7d837c363cb19082c
Plugin problem : jetpack 4.3.2 latest release (4.4.2) Update required
Wordpress problem : Warning Directory Indexing Enabled