Malicious PDF — malware analysis report

Static analysis result for SHA-256 df819222a33661c2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 361e1b3e8c1e72cb783caab25390483e SHA-1: 12e83cbc49f5b0eec39dcf5750e515131d37c932 SHA-256: df819222a33661c29bbdcc16a71362a1722fc056cd146163095179dc30c633a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term' parameters indicate an attempt to direct users to potentially malicious content. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=utility+warehouse+router+manual PDF link annotation
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d2474313---69463664605.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c8d52f38---fuwarub.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/85832437619.pdfIn PDF document text
    • https://seger.cz/userfiles/file/mivifox.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/21003134690.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/juvevofutidelaxedigi.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/nudavijekotubaroladamo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r4fn9p9n6ooc18c8ctc4nkpqhq/tijolenonelo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c74568993---93908014287.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/io3moda0oshnvkmdfkqb3ellb3/tutapejepej.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158eb2dbfa---446580651.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vpjqk0iu6m1trbnd1u1vhrtkc5/bikigefinasukofipaf.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/60344948602.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8847cd0ca3a3c2d4995621ddc5289e73/ritizuwitom.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/15178688091.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108172249463376.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/letasexasivutibita.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/81552029705.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7359626c7---xixunasajarifibewufoxi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/12ad9a96e5e5a1d2d5c7fb14a94a9a9f/zafevonofog.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1625075091923173535.pdfIn PDF document text
    • https://ecoretras.com/file/latotatuxupemipumo.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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 10680 bytes
SHA-256: 02624934a0ae46adcac478768402cbfbeb0625449bf0bbf6e4deaa667407b1e4
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 17480 bytes
SHA-256: bb8d2b76b7604e0bab6fd460bd8ecaef0f79d51a086b5c638861c542f75e3f1d

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