How to find files containing 'abc' as part of filename from shared folder and then delete them ?

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PowerShell

I have shared folder "\\Test\PQR". It has many files. I want to delete only those files which contains 'abc' as part of the filename and those files should be older than 4 days.
How to accomplish this using powershell script ?

Appreciate any help on this.

What I have tried:

Get-ChildItem –Path "\\intranet.barcapint.com\dfs-emea\Group\Ldn\Apps\CMCV\EM\FTPProd\DTU" -Recurse | Where-Object {$_.LastWriteTime -lt (Get-Date).AddDays(-4)} | ForEach-Object { $_.FullName } > F:\output_DTU.txt

I am not getting how to identify whether file name contains 'abc'.