Malicious PDF — malware analysis report

Static analysis result for SHA-256 34822af94d7d2939…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 23:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45076e2b21fa339e53294af63e4d65ac SHA-1: 83b8a2318d2c957a7a259d6fbfe768022488d781 SHA-256: 34822af94d7d29397ff2fc9ccbcdf4f42b9d0e0aad995eaaf7bee03387bc5c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous URLs, some of which are hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests an intent to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://chcial.ru/uplcv?utm_term=happy+mothers+day+worksheet PDF link annotation
    • http://whuntex.info/userfiles/file/25839657764.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/rotusanekoxetinemanututet.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/kerokuwadugado.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca138125541---larasovesatizige.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80f5ee287---51954894961.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/68463963551.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32798427898.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fetibebodavawupotife.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d33fa277c21b36ef2dfbcb57df508ff9/58512253549.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/luxizare.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e3a4a2e7dbc8781491dc48f23673e606/51561334285.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9988354dbf99bdad0e77024b376bcfc3/tetine.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/sodetavovusakej.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vogenugobufipuwanilovoji.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7b35df68---75497679239.pdfIn PDF document text
    • http://asustainable.com/global/file/sidamolafegovejodeb.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/64982205560.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/cb7fd29636d8355896b820635984a420/70310042895.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/kutuvuka.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/kawikatujasekurer.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/dusegixisotoxafav.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607441ee59750---savagabakasajokamu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/57320715299.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6kq0d7gjq80bs49m62tpkfs4s2/8824475674.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/ganoriro.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/pipumizulijok.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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 10700 bytes
SHA-256: 87e4a62fa991922112e8a93e4f60616093a1946bd17a8943110c0d5c65da1a8b
font_02_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 15596 bytes
SHA-256: c557651fd39b97d7f718c0fa8287fe6e8f03b2024097aa6a1c7f9b2a27fa091a

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