cityxguide.com/privacy-policy > "Correction/Update of Personal Information" > site maintainer's email and address, Hong Kong, China.

It may be easier to "auto-reject" calls. which may be difficult depending on personal circumstances, than to deal with getting the phone number or link removed.

allproblog.com SPFBL, not as notable a blocklist to me bestsexyblog.com SURBL bloglag.com Spamhaus, SURBL fetlifeblog.com SURBL hotblognetwork.com - instakink.com Spamhaus, SURBL instasexyblog.com SURBL relayblog.com Spamhaus xblognetwork.com* SURBL Dealing with what's often detected by Spamhaus an...

Differing forum-board software have differing back end anti-spam capability (ies)--variety of anti-spam methods.

Of course as a forum user, or forum admin without the right tool, the spam sending IP address(es) isn't/aren't seen.

Owner's website mentioned in sixth paragraph:
penguinmarketing.com

Google abuse > https://bgp.he.net/AS15169#_whois

Running: sina.com.cn < sinamail.sina.com.cn

www.borderware.com/domain_lookup.php?q= ... =1&go=Show (sinamail.sina.com.cn IP addresses with poor reputations running on the China Unicom Beijing / CN Telecom / AS4808 network)

PhishTank.com > wixSite.com listings via google search
www.google.com/search?num=100&q=%22wixsite.com%22+site%3Aphishtank.com+inurl%3Aphishtank.com%2Fphish_detail.php%3Fphish_id%3D+online

Such as www.phishtank.com/phish_detail.php?phish_id=5527802 March 13 through current date. Phish, 4+ months.

===REGRU-SU===
priceforuma.su
bestntarget.su
storehousek.su

I see now: It's in the domain name registration. MA = Morocco too.