Ask HN: What are these strange random strings spamming my blog?

I have a wordpress blog, and recently I discovered that there are several spam comments daily which have seemingly random strings in the content. The comments don't have any other (human readable) links, which are usually present in other spam comments. Can someone explain what is the point of such random strings? Do they mean/represent anything?

Some example of spam comments

https://imgur.com/3FVR7Yn