Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1a006afb313e66…

MALICIOUS

PDF

79.9 KB Created: 2021-06-14 02:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36b4481b2072d2f4835a09622a22e3d SHA-1: 2107e5d841225458239f44c2e09379bf45b94738 SHA-256: 6b1a006afb313e663e809f62d071ff76bbce028bc90f1b22628b5968b938e143
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=template+monthly+calendar+2021
    • http://cokhixnktientien.com/Images_upload/files/21178300896.pdf
    • https://netshopnepal.com/userfiles/file/36130639436.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/gulewigitufojazexegetu.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/4c31e71683106a8dd9266ed671c44c85/13815963054.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/87f9f0322bf6275ea8fc07d9e8d63873/17969197821.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/77545247109.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbbkfoku7eg9il1c2hfo5tjmi2/41479533433.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/2cf80c250b629501d154ea952027effb/zoxajamifamatomelanad.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160766a218684b---96840627254.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/7672845754.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e42d653f---ronigoduzusibemoriza.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ae879334---18599910022.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0632892f1793e74ca6f6914bcad40ea5/kizuwaxojuratazuxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fb50.bin
16b2d8758e194aa41ab18360886728735a4a7b363b1fcfb7ccfe1eb9e374d917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 5512 bytes
font_01_sfnt_off00010deb.bin
7329ead18c4960f72bbd7d933a259c9f45b6d9c2fc98b202ed5d620a8f95b593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 10836 bytes

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