Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f9a76dfc14c2ed…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 01:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c4318002fa85f2d83c48cb1db5a4f3c SHA-1: f5cfe3bb57acb8564d24f33d4d15cf6d212e5645 SHA-256: c4f9a76dfc14c2ed9378c8bfcaf3b51ed0ee3f991bd2209e007d784afb9236b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://zubrcup.by/files/files/katigotizerizosi.pdf In PDF document text
    • https://binhvi.com/upload/files/xonekin.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/25599534705.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903075055.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/99711947546.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nomuwoxinefobefor.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7cb114d5eac9235351896338aaea9867/kafukosajefoluxawijuw.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1e0d111b96df3b3710f250eae2b9933e/lowijifonobufurufemel.pdfIn PDF document text
    • http://vucert.vn/uploads/files/midozedazenelibalimasufu.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/muvixefino.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/wevakuziz.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/puzenex.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/beseg.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/65778592241.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/28884662220.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/83270830106.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/veboruwisomawafefel.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/waxopilirovanamu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nafimibuzu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q0h10jig9n3bm2f4e0f5h9clqv/nutesefixukiwodevi.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xumoxedoxavuxize.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613659531537f---21360642490.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/37744018268.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/lubajomogavokuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=flirty+one+liners+for+herPDF link annotation
    • 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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 10240 bytes
SHA-256: 42aa93331f859cbd165963fd58af605acdf53a4d12460391f590fea6be50160e
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 14448 bytes
SHA-256: 9d35f9a733bf0e11d5c329c04fa82d5dcce64b4f741c1d4be991d26775a0de0c
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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