Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d191363b9f7c87…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6c796bd7dba96368f590cd9fc3b76b3 SHA-1: 41b62e3342c0c094f168d50dbec66303de1f9c6f SHA-256: 41d191363b9f7c87594f2d9da5ad29bc4bad596849f610dde5e6768c13e43e24
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external content. No scripts were extracted, but the primary attack pattern involves leveraging embedded links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=at+will+employment+agreement PDF link annotation
    • http://winhazel.com/indigo/ckfinder/userfiles/files/sokawixopovidipusuvalafi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ed925fc1---gagiruzaderitumediw.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/98209694275.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/etcfe9dqbolionanoi2d5jrpa2/kukigiwedeponoroxale.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/rerejikebiniwagej.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6367ce79bd---71161113416.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16bb8648483cf847e8a50a44a69e8b60/15580167374.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b052c82772d8c4eab6c2830a2034ac82/98577904086.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/11b4073441c87508d603441e3db0240f/javenus.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/dumamap.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162517444210974705827.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/31692849599.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/kifezokofemikuvepugun.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qikplv3e4abe6b3tk8h88n59fq/28079929319.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/59681707457.pdfIn PDF document text
    • https://beaszemin.com/files/30865193076.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/82696010579.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50888a7b2---zabamuvimeze.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/notuneniparapageg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l22i74lelurhmk7ge4uleect9g/fajet.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/67360306966.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/tofupuromesote.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d7f33f224cfc895a960e2c41b9704ee6/62662755967.pdfIn PDF document text
    • https://andana.us/files/files/3123513915.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10608 bytes
SHA-256: b7a289897febc3434d1083e3d5e2ba3994097fa4037c9a6ca9629994d19bd472
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 17696 bytes
SHA-256: 200e8c05d5d5a82b97ba4862fd94525c04857310f8e809713bf0e65e15c3b711
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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