Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38be8fd466289c4…

MALICIOUS

PDF

195.0 KB Created: 2021-05-25 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 49c5a1b151f70376d7785a47c1df4649 SHA-1: d6609c3aafee79a97031b3d67e309306dd4f54fa SHA-256: d38be8fd466289c4c254a108e7d05fba643148d34f48bb36511d893fc1679ee0
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1059.001 PowerShell

This PDF document is flagged as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a lure to install a browser extension or update, and a lure to execute commands via the clipboard. The document also contains numerous links to potentially compromised WordPress sites, suggesting a link farm used for distributing malicious content. No scripts were extracted, but the presence of these lures and the overall structure indicate an attempt to trick the user into downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3ffc6667---bovozatosogowukevumika.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa8277b94---ponapikisakasexafi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/nadofuna.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c47bc8f71---77273178271.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079462288cee---dojovewoz.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ecb6bc219dfebcb25ab7bf520ebbfdf9/sotarikazuvisigedibutok.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160851d88436b2---58832363271.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/18706638608.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/021a387b8707bb6c1b438424347f32f5/nusufutosasepiwibafevukis.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfac7d0e43---44676619493.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1703427ce0e452a7afe45a1564e3102e/20011176763.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9b94501667ebee78390987e31f25963/julumikimi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c9d730a3---vakiluwem.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqmkal2u9fl0cglhp8ma1rnt0d/peveguvevusedobarokibit.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/665811a9e91972962cac9ac299b1ea2c/togubufukunabunenaganisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mozilla+firefox+48+free+download+for+windows+xp+32+bitPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF1E 5968 bytes
SHA-256: 1a75bf0e0dbdf17354fc4d79aa85bc8f22a5ad707ad5243cd707f2b32ac32f12
font_01_sfnt_off0002d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3AF 11888 bytes
SHA-256: 8d7e95ea01d3bd63e99c97ee94db907b1102eba57ad61bb282e0c6e49e3ff1cd

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