Is there a service that lets me check a URL to see if it may possibly be a dangerous site?
When a user exits our application by clicking on an untrusted link, we sent them through a "are you sure you want to leave" redirection screen. It'd be a nice touch to do a quick check to see if we should warn the user as well.
Visit the SiteCheck website at sitecheck.sucuri.net and click Scan Website. If the site is infected, review the warning message to look for any payloads and locations. You can click More Details at the top to review the iFrames, links, scripts, and embedded objects to identify unfamiliar or suspicious elements.
If you suspect that your website has malware, a good online tool to help identify it is a URL scanner. Sitelock offers to scan any URL for free. Type in the domain name for your website (for example, mywebsite.com), and SiteLock will perform a free malware external scan of your site.
Try with Google Safe Browsing API.
The Google Safe Browsing Lookup API is an experimental API that allows applications to check URLs against Google's constantly-updated lists of suspected phishing and malware pages.
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