Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9e6b05f570dd8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 23:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dbd79cab637f693e36989128090fb66 SHA-1: 294e5c3c20c34011390e5f58e767aedf6210b341 SHA-256: 89b9e6b05f570dd8aae18fc93c964d9df3049d65c1959acf7359657740e46cb2
216 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a lure instructing the user to install a browser extension or update, a common social engineering tactic for credential theft or malware installation. The document also includes numerous links to external PDFs hosted on various domains, some of which are associated with compromised CMS uploads, suggesting a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://eghamatkade.com/basefile/eghamatkadecom/files/37798517035.pdf In PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/wanekufovokavutod.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d451ec78657f05c30429d6be4bc26a2/kebajedexabezibopa.pdfIn PDF document text
    • https://dom-titan.rs/files/jabamodokebulo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6db8bbc98---xuxorufegimiluzifas.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/84577496495.pdfIn PDF document text
    • https://bselink.com/userfiles/file/63342982914.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/34d864f74cdcad9478e865bda8beb004/23065981989.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/68477323110.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/punajuvosimisutalo.pdfIn PDF document text
    • http://www.og2c.com/images/file/kemeloxutuje.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/bipuporuwomoxakaxokul.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/65077535851.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xefokojitiwat.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xitesaxafujejirezofan.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/74121023784.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • http://viettruss.com/upload/file/47172128823.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/24472881962.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/gawuwimuda.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/muxaselasijamo.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+studio+debug+gradlePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 18704 bytes
SHA-256: 8009bb4e8531d1bee9903704c7719d7c8f0fd93618daf1e36a1ca5186a40866e
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 10644 bytes
SHA-256: df43bebe52eef6354e000217b39678238bb3af568c6357a82cfd5089406f2a6f
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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