"Probing for vulnerable code" alerts - Where are the /links on my site? How do I delete them?

I've got WP Cerber installed and it works great, especially after my site was hacked a couple months ago. When it got hacked, I saw a shed load of nonsense pages created like /garden-furniture/dwkwng-13135 etc. I don't really know how to get rid of these pages? For example, this shows that someone was trying to look for vulnerable code: www.sukimarketing.co.uk/Cake-Toppers-411839-Cupcakes-toppers-birthday-unicorn.shtm Excuse my total ignorance! I don't quite understand how it works, but do these pages actually exist in my site somehow? How can I get rid of them? There's SO many.