Today I reinstalled the WHM/Cpanel and tried to install Clamav from the Plugin menu in WHM/CPanel. The plugin is reported as installed, and there is menu Cofigure Clamav Scanner.But the Clamd service is not available.
The problem is at the Cpanel Maximum Process Memory limit. Normally it’s at 256Mb, because Clamav installation requiring a lot of memory, we have to set the Maximum Process Memory to unlimited while we are installing the Clamav.