Your site and image are in NO danger - clicking on the link is what they want you to do so just leave the link alone.
Below is a letter I received from the Staff on this issue - there are several other threads in the Forum on this subject - you can report the Spam links to the Staff - DON'T post the links in the Forum as that gives them more Google juice for searches.
My apologies if you have received this email before.
Thank you for reporting the bad referrers.
Your blog is not at risk, there are no security concerns, no-one outside your blog can see those links.
This is a very hard problem to deal with and based on the last 5 years dealing with spam here is what I think is happening:
1. A spammer finds a lax domain registrar or makes a deal with a less than scrupulous one.
2. Spammer buys a large number of sites
3. They then fill those spam sites with ads or possibly malware
4. Spammer then spams thousands of websites.
- so far he will have bought the domains using a program and put all the ads on using a program so the effort involved is tiny.
5. Spammer hopes people follow those links back to his site.
- because his costs so far are small it only takes a few purchases through ads to make money. If the site is serving malware then payment per successful infection is made.
6. Spammer then gives the domains back to the registrar within the accepted time-limit and gets a full refund.
- if you buy a domain through wordpress.com you can cancel within 2 days. A dodgy registrar might allow longer but it's still a short amount of time. That's why they move fast.
So it's all profit.
Can we stop it? I'm afraid we can't simply because it is outside our control.
But we can and do block every domain that gets reported and again thanks for doing so because it helps everyone else too.