Malicious PDF — malware analysis report

Static analysis result for SHA-256 26106c73ff0a7ba5…

MALICIOUS

PDF

197.8 KB Created: 2021-06-05 02:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0451bb2e4df4eece4bb20deafc6f868f SHA-1: 4b623b2ca976a33656178ba617ec0a2d8bb6f016 SHA-256: 26106c73ff0a7ba5b255c00b99ee402c8884a2ccd0ce52cf07805648edd9acb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing or trojan activity. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://irlanc.ru/uplcv?utm_term=bilinear+transformation+solved+examples+pdf+in+dsp PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091d89377ec5---varodusasepalofej.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/vogog.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086175ddcd41---42130526108.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7395f50a---jusabidefiranetikusatonup.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/95157726314.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/94852766104.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c1c21e4e---79322848494.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cbe47362---zuvebuwikodobewu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99a60f40e---8718559478.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079712122228---fijet.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/00om60bipdkcpskbltuq7q1s94/manapede.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/54472733278bf41149ed168736e260bf/topusunokejevor.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8eb38c765571e06b8787118662dbdfc0/zenobodelujomemovawubujaz.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96f2d2940---ruvajonolofexaluko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF8A 5364 bytes
SHA-256: 20198eef386618394f3064689779e1f155d6db7e5adc06795f0cc731d2786286
font_01_sfnt_off0002e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1C0 11656 bytes
SHA-256: a05aad41da4b7bd29b363a2e9fa12811d3653ea690d62baa37727bba54f5e1db

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