How to covert existing PDF file font colours to black for all the pages along with no underlines if it has

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C#

ASP.NET4

in Outlook if we forward or create a new mail than the pdf file is converting with red colour fonts with underlines ..we use asp dot net 4.7.2 desktop application..We have customize button in MS outlook through this user can send email as PDF files to another application

What I have tried:

public static string DocConvertionUrl = "https://xxx.com/doc2pdf";
        public static string ConvertWord(string docFilePath)
        {
            string pdfFilePath;
            try
            {
                // Load the DOC document using Aspose.Words
                using (WebClient client = new WebClient())
                {
                    var bytes = File.ReadAllBytes(docFilePath);
 
                    byte[] responsebytes = client.UploadData(DocConvertionUrl, bytes);
                    pdfFilePath = docFilePath.Replace(".doc", ".pdf");
 
 
                    using (var fs = new FileStream(pdfFilePath, FileMode.Create, FileAccess.Write))
                    {
                        fs.Write(responsebytes, 0, responsebytes.Length);
                    }
                }
                CloseWord();
                DeleteWord(docFilePath);
                return pdfFilePath;
            }
            catch (System.Exception ex)
            {
                // Handle any exceptions here
                //Helper.ErrorMessage = ex.Message + ex.StackTrace;
 
                Console.WriteLine("Error converting DOC to PDF: " + ex.Message);
                return null;
 
            }
        }