I randomly have a 140 new subscribers to the ribbonfarm list with numerical emails on the http://qq.com domain and Chinese names that look like this 六年信誉老平台计划精准不稳陪睡彩种齐全Q57174166另有专业导师开课讲解走势盈利
Is this some sort of spam attack?
Yes. See it all the time on sites we manage. They're generally bots filling out forms indiscriminately in hopes of finding some field that'll be shown publicly for SEO value.