I see the problem. I found solution on WordPress forum (https://wordpress.org/support/topic/error-linuxcfcd208495d565ef66e7dff9f98764da01). It seems that this is Spam Bot attack which means that some of you files might be compromised.
I suggest that you reinstall WordPress or at least start with Elvyre Core plugin and theme and check if that helped.
Also search for any strange plugin in root of WordPress installation. Also you can scan files with available Antivirus plugins (https://wordpress.org/plugins/antivirus/).