Has anyone experienced a Phantom/ghost page appearing within their site?

I did a small test site some months back. I started receiving comments from 'spammers' and I later noticed an 'additional page' of course, I clicked on it and it took me elsewhere. I did some reading and the chat on the internet was calling this a phantom/ghost page. The chat circulating was suggesting it was coming from Russia and was an attack on google analytics. Has anyone else experienced this?

My question and of course concern is.....do I re-install google analytics or do I go with Yoast as an analytics plugin?

Thanks to all in advance.

Best Regards

Peter