Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5842df766b9428…

MALICIOUS

PDF

77.3 KB Created: 2021-06-23 13:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ab76784e211e5b3b7eee71187774508 SHA-1: 6904d340e0351265f8454a56e65c3bae4d6d2815 SHA-256: 9f5842df766b9428d90d93f4eb988430fd630efb385dde80544017e89f6f592c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a link farm or a lure to download further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c41c88c298---62666633615.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cde25c44---rirafebafunasorevovanamud.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf821c918aa---19063155522.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/pitasevikeronu.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/60091426269.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317b82de5---gujurupemefafalalo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a005961fe74---84177121771.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c75e8d30---zuxuzibegavimimovutunune.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e82917ac4---73026741575.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5bf26398---71533354050.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/957bdf6139cd116bf3a54f965f1e16df/61906240279.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/575e47b119cf5f8a0e447d6e71374b67/fariwuxam.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607163079be84---wozokezenudibe.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e348eb86302add68fc6d6da83947ca18/95961430193.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff343eae5---retadukurumiw.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kirupexunaxuxowuvazuxilil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=science+class+10+life+process+pdfPDF link annotation
    • 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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5448 bytes
SHA-256: 7d6cb96a3e64d6de0955b513de20bed3c44d5bfbfdf1fd87f5c6ae1c1b00c58b
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 11652 bytes
SHA-256: 9612aa5fa3e60759579421449287f062ca79243968abefd168aed0e479dcff1e