Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2dbaec351d474…

MALICIOUS

PDF

57.5 KB Created: 2021-06-25 00:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371316e8918e9112bbedff1559018c89 SHA-1: b44f7db851bdf737b69ae916e32f3c1f64971c92 SHA-256: 4eb2dbaec351d474e5e86b394fea8e7c3ddba4c8f5d4a1dbe24106c70126f09c
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 5

  • 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
  • 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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1f39ea6---bilero.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lom657mr7eaivbgqj4ukr7mhq1/juloboxovaza.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/uiega7uurdmo6upjj79pfm4856/78638710239.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f2a1851bf---vimazopikokenobapizofas.pdf
    • https://newtech-utm.pl/userfiles/file/30459542812.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210616011930.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/tt97s61eb9s21arr904mtlfbb7/11600070312.pdf
    • https://abe-rdc.com/userfiles/file/sebawolijirikelasoz.pdf
    • http://mp-journal.com/media/file/maremezumanabusosutef.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fe5cdc9e4431f3f1a6943d664084e114/72437161992.pdf
    • http://www.ecostroyservis.ru/File/detib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3061488d9---48150458371.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/gesudepuvilidi.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/aa5df4b98a86c7ef33afdd2634241b0c/32361660861.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3hdl6aknecqlavf5s7pii67ta/69955899252.pdf
    • https://nhorizontours.com/userfiles/files/16992782278.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8256a8a964---tizomiladunalimanareku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=coordinate+grid+games+battleship
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ec.bin
a32d12cda827f449579850f49b10678105db11c3ba0d384dd75cd9bf22e77d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 5416 bytes

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