Malicious PDF — malware analysis report

Static analysis result for SHA-256 14acf2ca623b742d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 03:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c32e292c4badbaf63b47714ba297a37e SHA-1: 4cb0e877017a2446f3163eabc65ec818db4f98ec SHA-256: 14acf2ca623b742db933df172b1791012ac647b1827512d062636e1461a6cf4c
136 Risk Score

Malware Insights

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

The ML classifier and the 'Browser extension / update installation lure' heuristic strongly indicate malicious intent. The document likely serves as a lure to trick users into downloading and executing malicious content, potentially via embedded JavaScript, which is a common technique for initial access and payload delivery. The numerous URLs point to compromised websites, suggesting a distributed infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=download+vitalsource+bookshelf+to+pdf PDF link annotation
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/28592b30ca193a7a616acb87d6f0c196/23541385729.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/refateruwa.pdfIn PDF document text
    • https://ksboutlet.com/file/files/diketomerakewiwotexaga.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/13262724370.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9726f39c6c---11574680748.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77984d8a3e---99181658997.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c2d42e98207655ac3222749de3a5385d/fiwizebafan.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wikaxalinuwaxerivarol.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wosamanibejadi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8phfmb4to3f0fis6qad4qr8a2f/giwibudakadajomojozalow.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/7927796102.pdfIn PDF document text
    • http://allasclub.com/campannas/file/dezalunisi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/76225545017.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///rijejawe.pdfIn PDF document text
    • http://ubest.ru/images/file/bukufeperigedi.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621277862.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/99724252564.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/93397632998.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/88kog4o6mhj4udj9mdsn8e0uui/kajox.pdfIn PDF document text
    • https://assistenza-termica.it/file/25109387537.pdfIn PDF document text
    • http://adveotec.com/img/file/jozowizatuzinobevew.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 11204 bytes
SHA-256: c426437c30d81242751db38f8c4d51c6f099c8d9546c607394b0c16923a754d6
font_02_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 18056 bytes
SHA-256: ec2e6ccc7bb5ee9e712c12283f30e933d98e670ec5c9deca151d2dbe1cce8d4b

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