Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a945cf3f644d02…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 05:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 238a972400b50373577930c474be327d SHA-1: 4b9975ec7f7998e8272fddcb5b8bb6ccdcbb58a1 SHA-256: d9a945cf3f644d02e6a010312effcac7bce9f47412b2a7a0a0c3bbc15f10f669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=cv+samples+pdf+for+students PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6icphehf2m24m2i3s5rnm9s45a/jezubebuxajojijanijumono.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kbk0b1fkceaen78huegnaqnmm1/noneruritiwofikazuz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1f7b907b71dfb54b650ab90e6f37848f/41970034593.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e185315789---ritigepegefazagisenavepax.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/powabujadisiromikufizu.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/pexosome.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///xegogitu.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/8102735188.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/mopaxadir.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb050c7c4d---badudo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2201147e---82272120060.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0099b76e2a---85786106614.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/towun.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2ce0634e---10466895354.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/medibuge.pdfIn PDF document text
    • https://biomisszio.hu/tmp/57184011963.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b25cb63570c836e00ac619da552daf45/64968775878.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kabulalagaduzajizofimit.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210710195229.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c32cc6211eee3900147c54b82f96c10e/sefujarefigiv.pdfIn PDF document text
    • https://phr4u.com/files/57848728748.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/50066203732.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a13594dd2---60143552520.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/newavigekefi.pdfIn PDF document text
    • http://abnicum.com/files/file/sotipawizedevifotewires.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/97180736389.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 17196 bytes
SHA-256: ae8bc1cb70f9a1ca7ca9c73ad48555aa1eeec46a975f3405885c114f84eeed74
font_01_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 10764 bytes
SHA-256: 38ab12a993fdaefdccf8f1820aaf68d5f7bfc4f92594bf39821b1ab399d25f7d

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