Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcfd1e02a165715…

MALICIOUS

PDF

37.1 KB Created: 2021-06-09 07:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 31a46916964469dd3499eb60fabc63a9 SHA-1: a2a0efc17f10944a475b09fc06e2ecfe554216f0 SHA-256: 2bcfd1e02a165715e12f200ba12a6990246e76eddc87f17087b195a7594cfe9a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a clickable action. It contains multiple embedded URLs, several of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The PDF_URI heuristic specifically flags the link to 'inwebjor.ru', likely a landing page for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

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 37 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://inwebjor.ru/uplcv?utm_term=responsive+signup+form+bootstrap PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/981ad00bdb84b11aff0ab717189ac3b0/44629134342.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/titavorigulogivutatopel.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c1cba821---subumopinoxufewekoreso.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/241403a42122bacbd13b19cc204216b1/13620769459.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3v8lsokospebj6ailkqcvbusk6/fividekusoka.pdfIn PDF document text
    • https://shopabrang.com/images/files/jogisituv.pdfIn PDF document text

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