Hello,
DNS hijack: "ariulanimkwr.top-berlin.net", "ketf4zq.top-berlin.net".
Either your DNS host allows creation of subdomains for other persons, or your passwords were stolen or the DNS host itself was hosted, but your domain was clearly used for malicious purposes and was blocked.
Any domain hosted on afraid.org can be used by other persons for dns hosting without your control. It happened for your domain, it was misused for malicious purposes - in that case, when nobody has control on subdomains of domain (DNS hijacking), we block the whole domain in order to protect our users. For you, the solution is most probably only changing the dns hosting and letting us know later (avast.com/contact-form.php).
Milos