Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db5657cccf55a50…

MALICIOUS

PDF

114.9 KB Created: 2021-09-02 16:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfb935e9531bc08d01cc717ad14f00c0 SHA-1: 0d7e2db55512ea4ccf6f019b07518e9851ad43c2 SHA-256: 9db5657cccf55a505a3400cc7f3eff3e0b590969a6dd61e1d30f0aec10c914b4
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. It contains numerous URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm or phishing lure to distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=literatura+espa%C3%B1ola+romanticismo+pdf PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608057e346f12---tofejolikiwotugomo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b82ceb325a459e203b9bfbfd9e13f455/44377419651.pdfIn PDF document text
    • http://salkim.com/userfiles/file/91698051670.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/puzisomop.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/dewadaramopuvafofugewum.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hmau128elfj4be2d06pkb9t8v4/13611425539.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4ba3d6df5f33acf9a18d9e1a4d85672a/ziwozefezegowexuwafobima.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3k97p1clb93d801kkns057gihh/87960848249.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58657187929.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/wepelituviribafoniw.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hc8pegtvggk5ee2b7r8mj5rjn3/tosepaxuloduse.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e13c753c727d15096adaa768b0c9a283/futumeluviboweg.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/30026503578.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/95612795158.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/44589236669.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b005a393160---7728616075.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2bqlttig3e9imems83ba6dj859/kapawodebos.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/pexufilazekitofeweko.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/luneriritajowurewosenatu.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/fedimokigavogawoxuwunekan.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c40f59a3f7---48321316595.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/69915321049.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_off000155ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BA 20584 bytes
SHA-256: a87bf349ecaaba05528000eaa7d3a689b097465e692f67ff9721a2cda0bf65ea
font_01_sfnt_off000189ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A203 11044 bytes
SHA-256: cf5b83a9109f6b844f2087ae5e9faa190df13255160c5cce9206b7b1d9ba1d1a

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