Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdc7ea17768f860…

MALICIOUS

PDF

48.8 KB Created: 2021-06-21 00:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a02019b00c83fe67de360b9b5beb987f SHA-1: 4f1511b1972fce3165710375d7c5b6ab33d36aa3 SHA-256: 9cdc7ea17768f860b7d467fe8e0c343b26455b52673491d8b62f24a2059c0ed5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and use URL parameters suggestive of SEO manipulation or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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://krisoc.ru/uplcv?utm_term=srimad+bhagavatam+in+marathi+pdf PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc5f5aa83---8741995908.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sabelozizubekifos.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89314381577.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2cd2b6b1091f12eaf132724ecbdf3667/dapafuretekujib.pdfIn PDF document text
    • https://invest.pl/userfiles/file/fakibapoj.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608925dc4b1db---3823725912.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acbade6fb---letokefulepumot.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/kidiwudijixiwajufuda.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3b9d22e5ba5a48b8d98c659b9a31b5d3/fazodawax.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/c6qnt9vv1g3rien8b9kij6pas1/93242610728.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974918448a9---piwulufedegutujopixi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/panorevekabi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9beafa7a9520a8c6b99264fbef986584/malukutopinuv.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/37085027055.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/11182598930.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/90181032728.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fupuxaladiwuxe.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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