Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b2adeb2a5ad5d…

MALICIOUS

PDF

40.0 KB Created: 2021-09-15 09:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d675e64db68694dd6dc39859f8ca04a7 SHA-1: 093aa8d5470e0181a1f3cc1ecb45f9bf838a490a SHA-256: 5c0b2adeb2a5ad5d9dc13faf070ccff350d07f912f440cd8bc331692199ccfbc
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot that hides a clickable action. It contains numerous links, many pointing to PDFs hosted on compromised CMS (WordPress) upload directories, suggesting a distribution point for malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8259

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 40 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.
  • 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://777mto.info/contents/files/fositujifubojavitagi.pdf In PDF document text
    • https://stallion-international.com/userfiles/file/19642343891.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pemafokuma.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/runuv.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/devoruvugelaladazogekur.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lj94bg7i4mpk4iu592o8nt9btb/69065749276.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/pokokefoxejelesaxu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fabikududogananoludosarap.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/vesipokiju.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613376a87e957---jibulekiza.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/15365153607.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vawugivitomo.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/87016726503.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135748596bca---28316728842.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce54d4ebe8---foteso.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/59601608230.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/13358347260.pdfIn PDF document text
    • https://tigapilar.com/upload/files/safumek.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/38032364882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=presentation+apps+for+androidPDF link annotation

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