Malicious PDF — malware analysis report

Static analysis result for SHA-256 659f25c6f18a74e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f72774e5af4237f3614076c3415aa5c7 SHA-1: 66da55dc04a9f99053ab78a2d7b52861431f6507 SHA-256: 659f25c6f18a74e9aca13e0b415ffb8330cb6648c0bfe8c32929629fc4036b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the document's structure is designed to host a large number of redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=swing+trading+plan+pdf PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kv8ftct2hjs3dkgjtor25tjfga/wozokobar.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/12759969268.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/47393304331.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/mejafovutodarisenibak.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/h00fe3d14b3qfl3n4ccgqi23l9/ximevafewilovolofojimej.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/vagujolijakudusunoxumira.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/84396629743.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b321c44---tupajenak.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98841411753.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fozuzawivopisokezafejazox.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/dizokukotonubogefiv.pdfIn PDF document text
    • https://mytopics.it/uploads/file/3026524252.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b2htcdk0i40jsl0otrtntbnml0/dinezazeg.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/92152413494.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/56970018097.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609abca19b550---rifubidegotozedek.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/vitibekakisali.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/38882811315.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/vawusujodedogit.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/69564718073.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/dojixu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd98995ed---kipokudaripolopiwipilawiz.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuxavusoxuwazoloxawiris.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o616pg45hq5mvevt3t4fi7gjh9/zipimu.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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 17384 bytes
SHA-256: 0162c614b89d102fbed98c7ab660160152ae39bb269f2d6e72bfe3e3d5a6e178
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10416 bytes
SHA-256: 5579135e5069f303858cb9326668c81c585bda232d2ece5d4d4e3ebad6842157

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