Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baf3dbcc168ae68…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 23:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c2e4357d2ef739459a8780556bb7118 SHA-1: 9d5924112d0475609f705e000b6018e53b39d52c SHA-256: 9baf3dbcc168ae687fdd6a267ec199636da4e72f067e2a86b6a59ca2414f501f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving redirection to malicious sites, likely initiated via a spearphishing attachment.

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://crewmak.ru/uplcv?utm_term=theological+terms+pdf PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/98qe5g7vqku3j9afddmaqlic0u/belupinatuviwilemasupuz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/67798327802.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/63412205501.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jajime.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/85b24e06b8e009710a33c4974ae50280/xubuwazodo.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/93105802110.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/visujesot.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/vexibonizilabejis.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/jatejasozol.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e37b66b82d3---pozufafovos.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/borijufatutomawetasozapub.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/a1l4ans14oouu68dshg989rjm0/26501066855.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/24756497040.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tutovoxikefawonatazivazod.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/5939467910.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123a00e4c676---pazusojinima.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d124166852---duxeroxaxigejikov.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fc873068f---34069275711.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/81951327020.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/maxogapedafav.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/13444075726.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/5035278862.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070860b4555c---gekijumesisudetapiw.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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10928 bytes
SHA-256: 8283777fce63daac9d7f1752eb646201ef1d97bb324c4b6b79ee847641865f12
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 17224 bytes
SHA-256: d9f54d745974f840263e11fd2461022022da2cbac1291426a8ac276c2bff276a

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