Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d16c58e59832d5…

MALICIOUS

PDF

101.2 KB Created: 2021-07-10 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39fd717bd67cc0952e162dc2644f77b4 SHA-1: 7e706e0f55bd4c76c797f72a5120057e08b5b679 SHA-256: 41d16c58e59832d5f3b7eef02627b6fcbb2b96b173d551c8dc25c0e173e8db03
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=certificates+required+for+degree+application PDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfffde44f5---papudoterixerodomonubu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/865c1dee098c4634a69f52700b91ddba/nesiniregoj.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428120752154.pdfIn PDF document text
    • https://pmms-online.com/assets/file/xofaruzipeweteparibigive.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ias4qs3dm6mdlufqjgib75kl21/fovaxapumu.pdfIn PDF document text
    • http://naucseto.cz/storage/duzikipimo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb932689a---85503390785.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5c6c658c---lolukaxitan.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852072318e---jaloseruvudejakubo.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tuwubasufurimukarebezit.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607935ad30d6c---muvazimowuzonisule.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rimoletem.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a6617e43f0760d04cc75e0fe8dd1e1a5/71569676201.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30f024750---dolexeboxed.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/sejinesuroze.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/86765163888.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de3769b9742---62230551515.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52f1834fa---madinutem.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/41522659742.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/4848970764.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094977c9323c---41061508303.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9uiehpl0u1t7mvpgc6fei14t7f/20721400309.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/387e5161e5c79f9bea15afefe881bed9/1598543666.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607192cc1f3c2---82047697039.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f1e7964aaf11b60dc1edb6d37d0533b/11266471569.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_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 18252 bytes
SHA-256: ea81db81a03f1747571a22bf12d98c202c3f681c4d4d89072e9a866369cc450c
font_01_sfnt_off00015592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 11072 bytes
SHA-256: c4acb81d45b4aaf6d17432c95b02628835d4e7643965b26e9ef2ab03650014fd
font_02_sfnt_off00016f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.