Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda80cde31c16d9f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69ed4e081683ec1e38f387ac2e49f494 SHA-1: 7c598ee1ea31846b070231a6a8b34708abb7ee8c SHA-256: fda80cde31c16d9f11e7b151d31911cb5f9be6f7b22c39214de77595e0e175b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such domains, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crewmak.ru/uplcv?utm_term=inclus%C3%A3o+de+pessoas+com+defici%C3%AAncia+no+mercado+de+trabalho+pdf PDF link annotation
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vavekoxodetorotejuri.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gadupadowumutezuporan.pdfIn PDF document text
    • https://abeess.com/userfiles/file/pigigivubavidut.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/5681773877.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3ea85780b---julubuv.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11130912069.pdfIn PDF document text
    • http://fteq.ru/files/file/vulepaxixubalidenan.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/kakebinosibojotutopin.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34305a12da---rujobodanavimugup.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/14785423212.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc2b83f94e---mazofibu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/23984985729.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/xoxexagorewokilutugotatot.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bca85bd5---61555836252.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/puzigelojipape.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/77303450141.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5a6a00af---69570043939.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/10090486817.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/misujexobolemejop.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac63d86920e---15256544266.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sos1f9402s1bjpdq9cdph5deif/78809584445.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f6iuqt57l0mescv5bj3fc7o94p/gopimemururadomadiju.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba954e6b96a---13324641833.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/95b511cfab87230d8698ced5e913977d/24752808616.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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 19688 bytes
SHA-256: b2c1dca0495d693510ad13cd7a3b0ac67656bdb429b27102eb638bec95960fa3
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 11504 bytes
SHA-256: ce59711876ac5861aa8d0e8fe11d87df0ebe72acfffb9fa0d1c898e96c408c7d

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