Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff41b9025e27b1e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 22:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8ab5fd833184225fa0b8689f6cd07e9 SHA-1: 872750e8168894a69e98dcccb934f75aa6d0de66 SHA-256: 6ff41b9025e27b1e4072e83196765aed1d7f72afeb5ba2a09e813868b05ba8c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deceive the user into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=rblx+land+codes+2021+april PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf7180a7f---mefal.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/tepuvugetezedugoxoluwakan.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/84339245685.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/fusivojunoxisojopotodimef.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/11807583917.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630536776.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/12476783548.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/boxuvurigewibaribo.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/80212586212.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161366f0b0be1e---jugexixamizeweju.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/85709806893.pdfIn PDF document text
    • https://penzion-palice.cz/content/66329688144.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/56344066314.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/likunirigomoweti.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/7512535248.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7534bb9d---bozajit.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1701476fd---jasawi.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/52503262215.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_084921_162.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/10583306573.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jazepuno.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/28208342857.pdfIn PDF document text
    • http://muszempilla.com/files/file/40842864067.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_off0000b9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 16180 bytes
SHA-256: 772d015af38a85bcf6c14f98add1449a959963f09c3c9b2ce541c50dc19864af
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 10988 bytes
SHA-256: d4cea628c6c649f75e9013fb504db824039afc0af7ff50649fc8d46fa0deecf8
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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