Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba01493c43afbfe6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 02:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c14e98feedc0dc138e4fccc59ec844 SHA-1: 576d6e2f6a9fce8dc8c7e6d53518d8658a3f2a1a SHA-256: ba01493c43afbfe6de4f8d20ee61eae7b3974b2dfa28fc98c60d5ffcd412b1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=outlook+connector+2010
    • http://paneldeconsos.com/userfiles/file/14284940444.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614036793d313---gobizevalagusesatep.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/70312370190.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/47087252456.pdf
    • https://borsalino.ro/imagini_ws/zaren.pdf
    • http://seattlebestteriyaki.com/uploads/files/wiwagusixoranelojuwudo.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64398dcc1---jedapo.pdf
    • https://ctners.com/ckfinder/userfiles/files/85886402512.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jidaweworufujamixoli.pdf
    • http://ombs.ru/uploads/files/40974693421.pdf
    • http://aftckwt.com/uploads/file/duvixegejolutanuxafal.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/70835592349.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/17eb6a663ad8b0a600783ba753c6e101/55868461053.pdf
    • http://a-mega.ua/images/uploads/file/pakexamonuz.pdf
    • https://my-natural-style.net/upload/files/gubiwelanas.pdf
    • https://demircanticaret.com/userfiles/file/nalavirurixesafemexukino.pdf
    • http://artin-intranet.com/ckupload/files/55680235115.pdf
    • http://lovesenergy.com/file/32032274584.pdf
    • https://vvpta-irvine.org/userfiles/file/janajipasesamojevopileguw.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/judejudulevegiwomaxe.pdf
    • https://gulf-rope.com/images/bulk_images/files/notawikufebamenidat.pdf
    • http://loveperfectionschool.com/upload/file/78331965854.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_off0000cbca.bin
bf5a8ac6b30d9be2f60e653b4bee2fdf0412ed4a393c87e26c17ad1ae8491959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 21228 bytes
font_01_sfnt_off0001032f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
font_02_sfnt_off00011b46.bin
ffc33ea3e569cfd37ca7a9ea061dee2d8d17fa91682d7eb91f22ff67b0febc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10312 bytes

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