Blank lead records created.

There are spam bots that often do this. There are several discussions about this:

https://community.marketo.com/solrSearchDetailPage?page=0&searchText=spam%20leads&sortby=&top_category=Discussion&get_results=true&dcategory=

Thanks. I've seen this in the past, but with garbage data (not blank) in the lead fields. e.g. Xxxxyyyggggzzz

The two records I'm looking at look 'legit' in terms of the apparent source of the lead from the IP address, inferred company, etc.  Assuming these are spam leads, they are either spoofing an IP or have hijacked a resource at the inferred company(?)

Also - is there any explanation for what the spammers get out of spamming the forms? Are they the landing pages for data and other info?

@David H no JavaScript, no validation.  Anyone running a NoScript extension or similar can submit the forms to the backend without the "requiired" fields because they aren't truly mandatory on the lead.

Nobody is spoofing IPs.  There may be malicious users behind the firewall at the inferred company, as you suggest, but it's more likely to be malfunctioning browser extensions or other security-related software (local anti-malware app stripping off data, who knows).

Thanks. I've applied one of the suggested tricks in the link provided by Josh.