Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cadb9d83ced54c0…

MALICIOUS

PDF

36.6 KB Created: 2021-07-02 12:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 49c9d2958400352ccf3a066f0636e1f7 SHA-1: 65736ed2c6d056d9342a9938f0418ab223f45f80 SHA-256: 4cadb9d83ced54c062ab428698dd2241759219f5672b1dd7d74c02cefe57742e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, with heuristics indicating it's an image-based lure. It contains multiple external URIs, including one pointing to a compromised WordPress upload directory, suggesting it's used to redirect users to malicious content or download further payloads. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 36 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://queure.ru/uplcv?utm_term=modern+operating+system+4th+edition+pdf PDF link annotation
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/umsiv1afi85d12d45uo6hp2oco/zanorerumapiran.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b717106e0---44949457615.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrljc3oe8k5r839u01bnfinrc4/68012028294.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/794d522f905c38537acf2ee727d7483d/pulilijikanofonage.pdfIn PDF document text

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