First, Upload your .PFX file to server and With OpenSSL you can convert pfx to Apache compatible format with next commands:

Run Following Commands

openssl pkcs12 -in domain.pfx -clcerts -nokeys -out domain.cer
openssl pkcs12 -in domain.pfx -nocerts -nodes  -out domain.key   

First command extracts public key to domain.cer.
Second command extracts private key to domain.key.

Update your Apache configuration file with following Code

<VirtualHost *:443>
SSLEngine on
SSLCertificateFile "/etc/pki/tls/certs/domain.cer"
SSLCertificateKeyFile "/etc/pki/tls/certs/domain.key"

Install MOD SSL

yum install mod_ssl

Modify .htaccess to Force SSL

RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{SERVER_NAME}/$1 [R,L]