Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2fc36dd207eada…

MALICIOUS

PDF

70.3 KB Created: 2021-05-26 07:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b17d78797863f42493440ef09de6db6 SHA-1: 4d8529d4654a69e3467ce34e7b86db5ab27f4d11 SHA-256: bd2fc36dd207eadaec30d0d341a400f9c6af4dd6eb3c68470909708f31489ae1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a malicious payload disguised as a template. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign.

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://medvor.ru/uplcv?utm_term=powerpoint+countdown+timer+template+ppt
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4195423e7---rekegilogisugiku.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9921188826a93360e4f9ea3b75d0e394/62819197718.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1430fa5cf6a57304c909c769efe09ee/vikobiguwatule.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b91ecb0d---garujemu.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0a466db1---85097223280.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5647685---pebibesewanugapidugut.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ec6d05fd---sisalawajetowizezezezube.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39b8fb4b3c3d328b16230aa15ca862d3/79258796222.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f105a452---42388136765.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076f524ce83a---51620697959.pdf
    • https://ideylia.fr/uploads/file/vudazuxomevazepokukada.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75430931282.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rdfe3ip3ak05ka8gqvioq918l4/24521284879.pdf
    • http://imaginove.eu/data/Files/77078556503.pdf
    • http://kibbkw.com/uploads/file/5272680545.pdf
    • http://dynamic1984.com/user_file/file/32956049485.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_off0000d751.bin
f4a7ecd99d21ac95271f61586fe868880d6ff4ed34b2c0fe30532cade807c377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 5136 bytes
font_01_sfnt_off0000e8c0.bin
d059645f07a681b01738b3a1120552281b8987ab550e75c6dee4e55d56e27218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10348 bytes

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