Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04073eb30798777…

MALICIOUS

PDF

90.0 KB Created: 2021-08-25 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aab0428b837bada0f44528f3ec960401 SHA-1: 043e3c7f7b93c672337382c2e8a837b4ec755e08 SHA-256: f04073eb3079877789fa33f9d9547044860ef2d206a070f505ac73f657fc6822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on disposable or compromised domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ubk-sad.de/azubi/userfiles/files/44497144273.pdf In PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/tominavijafuwu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5645253921---tapakut.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/66097829058.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/ligegedoga.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/rawixiranarupib.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ceafbfa84---53669817709.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/tedameloviserinemuwed.pdfIn PDF document text
    • https://langumeistras.lt/i/File/bolamedepib.pdfIn PDF document text
    • http://foodchemsino.com/d/files/49303028768.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091df47a75e0---24931827984.pdfIn PDF document text
    • https://tch.lu/files/files/61989611114.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/98494449884.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/luneninagudewuraxanipebu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afadea3d28---5299933143.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/rigokozi.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/75861078282.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/mipodelasexadizora.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/18339344654.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/665f1e69bfc2e95b424087f8afacb2a1/sirofevarezos.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/pamiwuvetuzunixo.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/buwabipuva.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/25567216464.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/34474816131.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/98159524321.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vm6llmrft94mdhdt4vt446jgt2/zubuwamegokatedoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=of+mice+and+men+play+scriptPDF 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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10800 bytes
SHA-256: 5a737e25975019b13f60d404c72fc51d3f5fa0065895d29573e31ca9ad6ada92
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 18080 bytes
SHA-256: 88578a93fb39c4cbcb81ca5c25f49a7353fb226e08fda6c6d71e51262c16e805
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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