Malicious PDF — malware analysis report

Static analysis result for SHA-256 d902413c4fa3fa1c…

MALICIOUS

PDF

70.2 KB Created: 2021-06-01 18:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e2cecde805950a3cd5db5b5f5ff0574 SHA-1: 854fbc541a8faacbdf276a1193e9a700f667e827 SHA-256: d902413c4fa3fa1c8952284ac6ba3df6bdccfacc007725c51f336f4f0f6e4a39
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1fadea4594d70709239ca56225a0c9e4/futimisug.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1891a13332d690fe06d41d40b4b9ffd6/61114643556.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1vng2f30dogd955861ncdk70ui/digilusoduzirofiraje.pdf
    • http://kfbi.ru/content/file/55132896338.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31094139---65924244235.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f40f653953d9887bcd8c7ba68681d4c/zumoda.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6cf5b3560a90801feff86f5a322cab58/6240162901.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/350689d63330ee47ed2cb8fa1ece41e8/tawojiwisesozufa.pdf
    • http://webinside.pl/userfiles/file/putogimolovekoge.pdf
    • http://rolmech-strzelno.pl/Upload/file/28215953528.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ab1qj7kunsmaooide71gbtjuma/vapegipajapo.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hsseu6jk7pnuvncssmh4h6h0o4/pudanotisizukubu.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fb4de5e412373ea3aa08c61506e1fda6/bukeburujo.pdf
    • http://on-video.com/movies/movie_data/file/28749703252.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609855c2dc42a---wisorubirovujoli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=diferen%25C3%25A7a+entre+bacterias+gram+positivas+e+gram+negativas+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2a.bin
f8287c633272a9426c01d22562a782ab5e11d6ed7d417610c9d1dc0759cd6bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 5824 bytes
font_01_sfnt_off0000e0af.bin
3110b208383966445ee80b06685eeb05ee4c454b59fc96c22ee9a41657e996e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 12844 bytes

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