Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a094849e06dc23…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 10:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01580d0aca6897954d93f34477dcc848 SHA-1: 17533bd07e7c9a61657eaabc195f6d48c08dc560 SHA-256: a0a094849e06dc232c7d0210ade064dffa4e6fde0b1711cbfc49532f159f204c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Numerous embedded URLs and link farms point to external, potentially compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=rtf+to+pdf+convertor
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/76229409163.pdf
    • http://queensparkview.com/image/upload/File/wodof.pdf
    • http://dj-venci.com/uploads/pages/files/zopurafe.pdf
    • http://kccmaul.com/files/files/poreritovika.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1lp5d7jmrg1ubhel3u44n2tu3u/julukawutuzuv.pdf
    • https://newline-eg.com/userfiles/file/19633930004.pdf
    • http://kxqcgs.com/filespath/files/20210914191645.pdf
    • http://wronba.com/uploads/wysiwyg/file/litapavutikukux.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/3471764507.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/77102439438.pdf
    • https://frontivo.ro/userfiles/file/77190004105.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/guwovumemimikosagifivej.pdf
    • http://eortak.com/img/fck_temp/file/majujeboxupalavevugosuvis.pdf
    • https://tarzminder.com/resimler/files/fejumatenafeneguvin.pdf
    • http://marupi.de/UserFiles/File/68953328014.pdf
    • http://iccarrentals.com/files/file/79854312801.pdf
    • https://autosaloncenter.com/uploads/files/52858642020.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/8868454242.pdf
    • https://protum.se/file/78824060872.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/ripafixojasanibokewil.pdf
    • http://boatmonies.com/uploads/files/vegazafazobozo.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1c5b4116149304b68dc0d4b8556fdece/67800502954.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9ibqdrg5gj3trd9m0kpd9lvrif/53909190571.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_off0000df5f.bin
b7dcccb756b8ed89ca7de4abbaae6f41edc074d3fe65613d48360cb612cf09e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10256 bytes
font_01_sfnt_off0000f696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 16792 bytes
font_02_sfnt_off00010ea8.bin
7d6c560fac69034de6fdf52bc1ef2977862020fb79175bd70074e3a25d2cefd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 17836 bytes

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