Strange Contact Us page activity

I've seen some strange Contact Us page activity, that has suddenly escalated today.

I see ppl browsing several pages, then eventually they reach the Contact Us page, and then I see contact_us.html?action=success

No emails arrive from this activity. I've switched on E-mail Archiving to see what is going on, as our website is otherwise sending and receiving e-mails fine. Other weird part - all this traffic comes from foreign countries (Finnland, UK, Germany) whereas our site attracts predominantly local traffic. Today, I've seen about 5 of these submissions already, all from different domains and countries.

Clearly, this is some sort of a spam bot traffic and not people, as they all make it through exactly 19 pages and we never get any "Contact Us" e-mails.

Is there a risk here of problems?