Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4eecd2c236d6e0…

MALICIOUS

PDF

65.3 KB Created: 2021-06-24 20:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33d9333a1dd01e4a845313292ec47198 SHA-1: 5e1d0541e96b77517aa70f25bd1a62b1d8b26a35 SHA-256: ab4eecd2c236d6e0cceb6b16795ec22d6dc547a59f16963e023e71ae5ffe9dbc
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to compromised websites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirect to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=free+batman+comics+pdf+download PDF link annotation
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddd607fe8---fixubimabazimixikuxizigom.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5ed624c63e44d8742ce9c42f7ba5fb17/10490973090.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5cca61a6eacfa8742d852aa429b2dd0/febumekovidugox.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dg94u6d838m003to9upgsj6i56/46805945744.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061019364980554.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/falikarofedagaxigijud.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/42404839407.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210609_B499A41F97B4DCF2.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a01795b2c3c---58691337865.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0eb8b9d4ff8696e0606b69da767c970c/89868361516.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095d27b07ddc---97653750125.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a61657b4bec---verulekofabonugugepad.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4425e9bd7---kenokom.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7a99c763555661612c8d017da114847b/19770806214.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/85582744883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5488 bytes
SHA-256: dbfea4c23d940f5acd2d992ca3357ea9baa6607f4047465bb7a0eafa849d4d0d

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