Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb57a3dbf9045b8…

MALICIOUS

PDF

137.9 KB Created: 2021-08-10 14:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2eb60f7c73e2d2c721e41a740dde06d SHA-1: a431be9abc387af75191ee54be2af92024892789 SHA-256: bfb57a3dbf9045b8f36fff1b84788ec207e523ce1fa29920ca710a5e368cf064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c306c0cafc---fifabefupogerulodotamiza.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f932aba7---kupomudoginefirobixewub.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e60c9e23f9e39897cf743f23e57ecdf/88741129758.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883f6b68c8c---fanapinusarejababowav.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/xozubim.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/farerulupuwaduluze.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/jimodikomenuxatu.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/tikukelevob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53303c6553---70024191438.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082af3fa89ef---24715947070.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a4cf8fcff72f8362fcc5c9ac9bb57ff9/40514812597.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/85416305561.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xiwuwuditisosanutezotosip.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/6732179420.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45b750967---13719432594.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/pubimixuninuwipidikoja.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebc2400ed---91132961465.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd1ed3864---kibiga.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104570dda349---84605537616.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lesufavuviwisuvag.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/090543255821fbeb8810c9a8b6e67c90/15164847043.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/ditiligitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unbreakable+brain+pdf+free+downloadPDF link annotation
    • 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_off0001bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D320 10552 bytes
SHA-256: 368ae942e69eb44051ced335d94e54cc6807a9ce96a2f501e17e6ea31c4f8c68
font_02_sfnt_off0001eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB0A 17576 bytes
SHA-256: 18911edb4b15b2a5ec69eae070f173a44d41b61051e030ae85f3828360a793bd

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