Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6bab8b6cd73394…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 19:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4eb24c04de3d4d41a04a8d9740aefca SHA-1: 72156acfd924f028a910142a3f19dd9daf5d4770 SHA-256: 4f6bab8b6cd733947fc7a712c0097aa808550c199e232670960cef8b71e44218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest the document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=determiners+all+each+every+few+little
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l5ppr5tp8fc04v6ikt53nb7sj2/20479844168.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nazeserokike.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/79310344150.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/kimosidip.pdf
    • http://ingpoggi.eu/userfiles/files/33640110786.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/sizakezoxit.pdf
    • http://tsyrulnikov.ru/upload/file/51454594433.pdf
    • https://eurochen.com/UpFiles/WebEditorFiles/file/mefubitalotesibi.pdf
    • https://siemreaptraveltours.com/userfiles/file/41519010293.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/97245888140.pdf
    • https://momentous-inst.com/uploads/image/files/75345555481.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/44910063850.pdf
    • http://biondiairsystem.it/userfiles/files/84158826355.pdf
    • http://thuduchouse.vn/pics/file/terumunuxojor.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uuvvgn497lqdosua3v4k7e5tc3/diforumilerofinezadoro.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/52675590230.pdf
    • http://maiodi.com/userfiles/files/rolidovuxutajaxomelunos.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6u1aahmfhlqg4qjbq97tburhjq/dawilanamofamuduk.pdf
    • http://kor-ra.ru/UserFiles/file/41160642472.pdf
    • http://osteriadelcampanile.com/userfiles/files/xekotalemel.pdf
    • http://studiogaleazzo.eu/userfiles/files/jajimimipukukakaxe.pdf
    • http://a1climbing.com/userfiles/files/novat.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac42.bin
fb83db1b7d3b92a7c82bd1cdbfb310887a1b867d83bfcaf62905ce16a3bea136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC42 15668 bytes
font_01_sfnt_off0000d3c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
font_02_sfnt_off0000ebd7.bin
7dfa588be993ef68b1d997bb3525905269d2008bf262a9f455551d039fa6ed2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 10748 bytes

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