Malicious PDF — malware analysis report

Static analysis result for SHA-256 591eefe1030e1b7b…

MALICIOUS

PDF

104.3 KB Created: 2021-07-01 10:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: afb11e8b383b5c82e4a01ab20f441785 SHA-1: a68e3c36e796ccafd62892e4a472ef3ab57c922b SHA-256: 591eefe1030e1b7b8b9b0d68587f9fb9918713f7bc37447325d24650c138d3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rue1q93bqilsne0absfocppgp4/dutefawonutulividobij.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcdcb5e7359644e1a843ad81059d8a5e/ludazuba.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bitifapikuxizeji.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/58962481614.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6f5663035d2da9a43410a201e0b5eda8/jozemimoxezavinogimugaw.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pijel.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b626c61c07d---64644558359.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/35376343276.pdfIn PDF document text
    • http://envigest.cz/upload/file/ferudewaniwux.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9fc04d4eeb9fc6c69d808b8b0eb8ecb9/79059961640.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/17746760838.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8ca9a30b086418b748419a4c3e094585/7460935444.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108cae0ea---fopat.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/70337212389.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/mufujigiwopa.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/805cec80b66b7882ad79106b53b39d3d/193607804.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e369ac465---bijuwapamowewavoda.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03dfd47608---66082975072.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/40897772259.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/18e66a2a6a911456a8c9a05728c3a226/wenato.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/49124621da71bf933e72b4bc9a31a57b/mefamitarijonujibosu.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/fonojefoxuvufulimokivot.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f0d5171e---62202544098.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72733653641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+female+wolf%27s+name+in+jungle+bookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 11136 bytes
SHA-256: 0b7284dd802cac669536a7a923003f2e61ada3171eb2a3928e27d9b7c0903ee4
font_01_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 20592 bytes
SHA-256: 15d3179bcda982c3131c7917a058c70991809784203c2cb41ca18fad94e10004
font_03_sfnt_off00017997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17997 17296 bytes
SHA-256: 5a8f84f5bc72843c4bc332cef6a8d32de9b61cceecc841a518f182f84b06876e

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