Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca193c4d6bf80b1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 11:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b99179633645f13323167012fb9458ab SHA-1: 8464eee763953e244e207069f71bdf00111cc11e SHA-256: dca193c4d6bf80b17d4e2d14fceaebb2f83e61e6f404af4fd07aa24495289d81
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The heuristics indicate lures for payment redirection and browser extension installation, suggesting a social engineering attack aimed at financial fraud or credential theft. No scripts were extracted, but the embedded URLs and social engineering lures are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ketchas.ru/uplcv?utm_term=transfer+number+from+iphone+to+android PDF link annotation
    • http://anhbanglaw.com/userfiles/file/11631139527.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/38711845846.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/fasakotuxofogage.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/nokomizakel.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a6e6d46b---kuxofikedesejupoge.pdfIn PDF document text
    • http://torgoborud.org/images/file/kiwifatilan.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/dujijufuwixetisim.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/45776326329.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6fb6a6a1---fexil.pdfIn PDF document text
    • https://2acontractor.it/images/file/penumim.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/13912906053.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/56290560712.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141849c558ea---37957073529.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/gumofevetifes.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/2254777823.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nunatoronibeduzelawibov.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nifal.pdfIn PDF document text
    • http://ubest.ru/images/file/budorademevoxawavoga.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/89870883693.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/bomag.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/28215918285.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ml0p7b883ttf9modqqq3s0nq1m/nitujekibufesoritogof.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138304bb05ea---57308811080.pdfIn PDF document text
    • https://znalac.com/userfiles/file/24044858813.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/vozojofarakido.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 10920 bytes
SHA-256: e1efa587bc1331129e72725fb0f47eb04fcb223bdc44e15c59f31fec9f6e5be7
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 16924 bytes
SHA-256: 09c31ba9181ff06a7e45318c29d983916db346eb55fcb18dcbed648e22c887f1

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