Malicious PDF — malware analysis report

Static analysis result for SHA-256 138398d960904074…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 00:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68971dde57868b2ed337cc44045e375e SHA-1: aa66bf8276d92dbd8444b02b1620f3c95bafadf8 SHA-256: 138398d96090407401bd6db76a2d0a485eb31e49b030049e5015010baeb02763
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1598.003 Subdomain Acquisition

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of both an advance-fee scam and brand-impersonation credential phishing. It impersonates LinkedIn and directs users to a non-matching URL, 'wastran.ru', under the guise of a contest or prize, which is a common lure for advance-fee fraud. The document also functions as a link farm, pointing to numerous compromised WordPress sites, likely to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://wastran.ru/uplcv?utm_term=contest+of+champions+unlimited+units.
  • 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://wastran.ru/uplcv?utm_term=contest+of+champions+unlimited+units PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe8227d7c---regoratalozigejubojafago.pdfIn PDF document text
    • http://poiskvod.ru/images/file/xokudoxixas.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/25489374885.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/96577306886.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eudutad32avqtogjart2aij556/jupojakuxorebekude.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/jozunedevivonav.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210622_5CD48AA84A700259.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5386c380a737956f51bfa6fb5d0da1ff/59131061494.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/39926629370.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/94505974109.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/fosijufow.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8abe5c8c99d537b32bd220e02c5fa778/sozozorutojujopuk.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/fezufeke.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc271e2f9---dosukuve.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/do3uoe9j2bqbqn6l8045o62sds/34252443776.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bg0c8griag3dm4jrqpt14fm4f3/59520314616.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/60420329966.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/99311624029.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/p76jgch4k5p875o2tgr6b1hmi0/kibakigezipil.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60a30ec1b470399fd17ec79f3aa8df32/48872100612.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/16544108157.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949b9ba8cf---ropixebagepexi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab945b8444---19434932863.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/fosadobemawaxuzudovu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca02f27aa7---bipurupan.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609293e0c2926---37816987270.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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 17072 bytes
SHA-256: 9c3abfeb99bc1a507519ffb131b6c9ea8bc5f2568127eb2f028f0e9bbbd0b364
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 10916 bytes
SHA-256: 1c15f6c4b22e0298e473eda20b2521f43071ed973872f93f7ed035d4662bfddc

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