Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f783ddca36f5795…

MALICIOUS

PDF

131.3 KB Created: 2021-09-07 11:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 514310392c8f916c62c54e68f35d46eb SHA-1: 0445e5053cb3e79e0e2a461c43a7863a8e6e921c SHA-256: 7f783ddca36f579596dbcbf4e93c076a8714e8e3434b01e59a120b9e1b4f3285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to websites, many of which are hosted on compromised CMS platforms, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ead10d80cd06dfb27870b89564f66672/puvenigozazuse.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718cd0f0281---35228569480.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/karatizafokazajakez.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/30956128084.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/61709553462.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8c4e5faf80a16e2887bf45c5169f5e65/91977689789.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/kilulasuvomegerokexanejo.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vimejiluxototi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/82581966285.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4464b6588c9e660ee30541205f8c467d/japuzeloxokudizoloras.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2b30k5il2tqju8if5jg4ee6qka/11437247288.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8m5gr0t0kmpfurpb408i6t7gi6/51434325796.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160877f67a82be---mobopur.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a37279578---39179102547.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/patodiresabagosatifizuk.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/lavetewobodurem.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464151fbf1---degure.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/45522668978.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8b1cc1eb7---48329344120.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mevejesawav.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///45214446271.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b44b7744b---55596422046.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/nibigorigevaragepota.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/85352677781.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123492cc2820---diduburomimirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chef%27s+choice+hybrid+250+electric+knife+sharpener+manualPDF 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_off00019b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B30 11772 bytes
SHA-256: b54f25bda419b92ef10bf7656a3293481495ef2429d88b2982e8be1d52cc5f42
font_01_sfnt_off0001b713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B713 18544 bytes
SHA-256: 3344cafdc271b5c5d6fba713c9cbbd74b51e147696ed98f77af32a1dbe7a5a68
font_02_sfnt_off0001e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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