Malicious PDF — malware analysis report

Static analysis result for SHA-256 3189994f4f5343e8…

MALICIOUS

PDF

104.8 KB Created: 2021-07-09 12:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1c7584e3b906c153d802c94672797ffc SHA-1: a54ec68b08d68a2e4e78a3e5d820757165a97588 SHA-256: 3189994f4f5343e80c64e8c2f72a54ba19a3054c823639c054382464b44e64b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=christmas+story+red+ryder+quote PDF link annotation
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/49c6f0e12b7269eb1ed2ba3cb391926f/95421148855.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3c227054---85527599293.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/69529204113.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e096c91761e---tasezaviwebijivixewedim.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c5f48634---20243937650.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/9252442757.pdfIn PDF document text
    • https://castel.ro/userfiles/file/totisipomadetisovedatim.pdfIn PDF document text
    • https://europartner2.pl/uploads/rumos.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5cb161f962e500b7ae13578a69295815/17791389707.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9f90762969f01e0bde3e8535d1126d76/reledurezaxovalulemuv.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40236726976.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2c9cccc0---buretomumivutunuvuju.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/73557572302.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/kudagikexakamu.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/lozurevifalovilovolujol.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1870237cbf---losadosizofelojawiziroboj.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sowovinumuderilifiru.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/pifasi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/65e8d10d3a60d2af8c7661d71d7dbbec/27795159060.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/18379066659.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c2ab8acd5d4bb899141820d8261b4501/difilobetuseb.pdfIn PDF document text
    • http://voijin.com/userfiles/files/21117926554.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pavodu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 17960 bytes
SHA-256: fc8f6c5d4b479b89911503eace763a96fbb15bd3f90c8674196dc6dc918dbf07
font_01_sfnt_off00016550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D67 10756 bytes
SHA-256: efa99f6fcfe937c5faa87e7ab9e6d3b9d87d07a458c398c0c0215b5907fcaa72

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