Malicious PDF — malware analysis report

Static analysis result for SHA-256 8064ba79904bb9d1…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 23:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 873c604c3136d434ac60ff6df8380546 SHA-1: fee78965845648a90a6de4b62a08985be1819133 SHA-256: 8064ba79904bb9d1801018fd1a54214a96cc5fca6fccf25e500e880d69f8f5b6
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware installation. The document contains numerous links to external sites, many of which host similar PDF files, suggesting a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1bfea8d1---57859902026.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bhkjm7oics2br2b3qac22e2ol4/64913616741.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/43832460385.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/n9u49qs42rofatdetl953or1j6/rezedigebewifatufunop.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/rizapuganasof.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tapenurokoxoxosonuvoxa.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/91850946465.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/28069631616.pdfIn PDF document text
    • https://schmitz.cz/res/file/53441895527.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160842a7e644a4---55069398456.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a837be3bb---25312914404.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/vefapuxalavulugine.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/p41afquj6f0ucc2ifj1kqrs48d/2280839134.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mva1b8ljfvhsdiko3otqp4p65b/devita.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d738d76fd4281543457300c2bad39b7c/defodiresofa.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/234332690.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nenaduxepuvupegogimipidud.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mosixavoxumajuzuvipekite.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/30215676570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a719faac1f1---62705303050.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982af87dfb3---7374196469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dtw+to+cozumelPDF 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_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 10012 bytes
SHA-256: a148c8f3f8e92b5b00f76a647beb64a8ceefcea498264e51deb8d3939c3b7fcb
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16436 bytes
SHA-256: ee12a7b8518ca64b449d4d0d81b12e681ed795f1e63f99cdd5ccf0e0f9a04882
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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