Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd156077dfa3b1…

MALICIOUS

PDF

116.6 KB Created: 2021-06-30 15:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 000a4e43a7dec480df982521a8cee57a SHA-1: f83aec4337f27a5524f72067f64cde874bb324c1 SHA-256: 90bd156077dfa3b186961ab13fef828f6fb7ebdf7d2884b06a60ec0efbac0e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=mn+2+paramagnetic+or+diamagnetic PDF link annotation
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5edaaca0f7beb55d6a4a1e164615e8b3/34602570968.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb3f5541dd---rorozotejorosajadipasota.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/retazugajom.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///27055925211.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nikabemumofiniv.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e219c4dc5---wixenozafirovox.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417aaa6b2c---zuranumapotike.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985e84484b5---83429232401.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d2581173f06---tazunixipa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc24e06627c---pibaberuvid.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/f4s0p4il49evv6f9ab65vbcckh/90234868867.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tg5i8p0orrnmttkkdq8gr6aefa/lonut.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162468971257.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/61ncnvh147nrlbfgdki3si0tb7/sepekerororofagiwiperaf.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6388f836396d946f1c41a09a4eb17c97/40411396323.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/desevukebekujawizuped.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ebc25064678331b661c82c5fa3f3a1ce/21910307867.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/96623963451.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/64866514606.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280255224988.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b468a8f64b---madaxobatera.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/lidul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001501f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501F 10756 bytes
SHA-256: 53e7322c7018403619ace5e7fda0e16b4409d6394b78bc276af2f418b8d017cb
font_01_sfnt_off000168b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C1 2460 bytes
SHA-256: b7e098e5b7bdf4b7fb68af3a21dfa1b3d05baa87c85dda46f068d4b7903dedfb
font_03_sfnt_off00018b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B37 22524 bytes
SHA-256: 8b2f4bdc1606cfb17706714eb31909280c31262e4e58bdc6c5ca80d6b9ad3b0c

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