Malicious PDF — malware analysis report

Static analysis result for SHA-256 c943741838bd5af7…

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 03:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b53b013c8c3d9485868dd900b29f36d1 SHA-1: 1e1d9acca45585f06a611e030b183083ea85d533 SHA-256: c943741838bd5af7f68378ad981a0ed7ec7518660efab4053058cdb1a5561c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/neoiv87u6k566u1ja8ogapk4ls/90567717651.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/dazivivuwafatisojibobutow.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/32157882191.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7877d39e4---77402722923.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74447823de---7433353494.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/27641486072.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/navetavoxuxunumubivaxadil.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/71af16a92bd1d75026cd0e35e802ff6b/40771085940.pdfIn PDF document text
    • http://tipiland.net/upload/file/munejaliza.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/repimikatobipanepebiwu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91a11b15b---gosunidifisobigu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mubizegel.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8k6q2vpa7lqs1qnkkmsna8b3cd/70822777420.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab59f02c2---vefetodoforejivebaliriza.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/75744878293.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f64e9cf721a00d7121dab88b5b0ea8f/vemotexufarujofoxudo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b7b40baa---15900414500.pdfIn PDF document text
    • http://sam-global.ch/files/file/zawemadaz.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/tulofubug.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cebfdc6bcdfecf3a84eab5aa11c28c6c/fivonaporono.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075021ac9e96---nevitidetidarol.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/zulujavivodivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=shreve+chemical+process+industries+pdfPDF 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_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16992 bytes
SHA-256: 01de4ac06b15718e57057f7db355233ec38e3c39ca43991d440e6b3568fbecec
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 11128 bytes
SHA-256: f7d9aafbca408b55de77fa7384cf38372b18faf361ad19470c87d12cb32766a7

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