Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0c596ce4d69837…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 12:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8df7197491bc206ad3c9f9ce3743b4d SHA-1: f40da63e635236b477cc27347c2c3945cdbc935a SHA-256: db0c596ce4d698377266a7743f4a6f2b305ac87ea25d0391b80c860621841dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=download+candy+crush+saga+mod+apk+unlimited+lives PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf9628aa9---bavuwajogutoviworu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8c221fe7---bisixo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/3214579152.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b258a67bc---30668697790.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/14850431085.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97475593815.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613736c4a9842---79464735221.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/95605124576.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33820845778.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/tamazuzomanod.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/rozewevokiguvina.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138588ce96e7---80084877187.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/73161400648.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/rawirezitapini.pdfIn PDF document text
    • https://polaria.cz/images/file/vixidovikomuno.pdfIn PDF document text
    • https://superpart.com/files/polupilagosulafuxerifuwet.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/wokovufavijowebowip.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5f359433---kazegat.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/gitarobeviwadinipinowomi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/5368959863.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130c87559fc1---fidinenonutizuravuvasixe.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/pinexodamivilub.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/95461077883.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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 17716 bytes
SHA-256: 34ef3eac653ae895e00d4e0491ca1cadd5ef43fe9cd23f7bdbae3b1b8f584fe6
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 11420 bytes
SHA-256: 5a00eec4d636db4a4160ad88a8714e0a738d018154a0f6369fd5c6b4ec665c85
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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