Download this:

http://sourceforge.net/projects/wkhtmltopdf/files/0.12.2.1/wkhtmltox-0.12.2.1_linux-centos6-amd64.rpm/download?use_mirror=garr

$ sudo rpm -ivh ftp://rpmfind.net/linux/centos/6.6/os/x86_64/Packages/ttmkfdir-3.0.9-32.1.el6.x86_64.rpm
$ sudo rpm -ivh ftp://rpmfind.net/linux/centos/6.6/os/x86_64/Packages/xorg-x11-fonts-Type1-7.2-9.1.el6.noarch.rpm
$ sudo rpm -ivh ftp://rpmfind.net/linux/centos/6.6/os/x86_64/Packages/xorg-x11-fonts-75dpi-7.2-9.1.el6.noarch.rpm
$ sudo rpm -ivh wkhtmltox-0.12.2.1_linux-centos6-amd64.rpm