Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea63487a752a4d0…

MALICIOUS

PDF

47.7 KB Created: 2021-09-16 22:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60a912e9fa1a172fc12ef97ae7c76fd9 SHA-1: 3449faafeaf0b44beb647a7ec7146c20245d3601 SHA-256: cea63487a752a4d066fd3ca3662b4358527cb6b17dfa93b9347b74ffa5304cb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of external URIs and link farm heuristics suggests the document is designed to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=redmi+note+9s+price+philippines+128gb PDF link annotation
    • http://tieclangman.com/Images_upload/files/narotis.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gijovubukamopoposova.pdfIn PDF document text
    • http://warungmimpishio2.com/contents/files/moluwanos.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/79885911124.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428afdd1717---16035231775.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/69444295371.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/61858435449.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d9676b40---69194985251.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109050645244655.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b25d7a04---15363752526.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/47550994290.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/60008922893.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gunakix.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/moniguzuvip.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12018703295.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/74768830715.pdfIn PDF document text

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