Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec158f1c20b7abca…

MALICIOUS

PDF

58.5 KB Created: 2021-06-07 02:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a37214204cec41b6045e0ec7bef67086 SHA-1: e4f67d83a0a48867ea85855c3c31ce54966b364c SHA-256: ec158f1c20b7abcac6a30745f90f134356ef6cd008b88b9e47c65744df5683b1
154 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging the document's title about economic theory as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8897

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.
  • 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://philabc.ru/uplcv?utm_term=m%25C3%25A9todo+hipotetico+deductivo+y+sus+ejemplos+en+econom%25C3%25ADa
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/07540e59de20b687563b9fede1408684/78004545805.pdf
    • http://kfbi.ru/content/file/36273266315.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/fht825j3fjv801t5s2k1jtp6ve/10063563867.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b3104e9a55fb31101669a55a20747e82/pijepob.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079f31ba089a---ziwevumememij.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742cd9b83f9---wovixi.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983693a4f46---92797161168.pdf
    • https://planet-for-events.de/userfiles/file/jamadowugosen.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f42bf706---57881924121.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bkb9l69lufokh31kea2m7vueum/tobado.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05ea73111---senigizuzizuxa.pdf
    • https://vicotelecom.vn/static/source/images/file/93416938768.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5hn1uaab503gem3vn0299lsmta/zudum.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/08ec6c08df4d2bb8b34f624c2f5aa8cd/99854586248.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/oh3sbkhvfq138pvh60i4pp3kbd/88402614566.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d024e60c---93599959584.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eab36de3---65792595382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db99.bin
260732d9c11070799064746e2a31a12ebd980435e2df35168a734bfb4ae41a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 5656 bytes

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