Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f294b89a4dfd6c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 17:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1421f47358d2ee384c396be55f4f4c7c SHA-1: 810249a6c089ca7e30c7766c605f2b501f6de412 SHA-256: 08f294b89a4dfd6c5a6a41d98ac14ed0d38d2aaeaf648c7d78803425f1ed3fac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://krisoc.ru/uplcv?utm_term=pokemon+sovereign+of+the+skies+english PDF link annotation
    • http://mwflower.com/upimagesfile///nunonekaxo.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/79349264077.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/22903498051.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d40c925bb50217a6f9be7930d8607863/napewixevitigewefujagotu.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/faxeletilagosenesolupolo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xewakuborekadop.pdfIn PDF document text
    • http://polandpools.com/contents/files/17753899256.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/saxibujokimuxopolera.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/xoposomubevi.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109120036262609.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcfbd0f75---timodonabopomosob.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lupadijenu.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/79813547379.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/lofedawopesupubuxofov.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/ropot.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/xaronu.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wakaper.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/82663155107.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/sunosoxabo.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zidudasopojukofakefo.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210907133404.pdfIn PDF document text
    • http://valeneighbors.com/userimages/purigasi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/64542984542.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/44014790549.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372105d1239---74771606480.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/96787094388.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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10656 bytes
SHA-256: 5d3c3acfc1acbe2d57c15b7338dbd935c74e98ffeb281fd6efdc216783680ef4
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 19644 bytes
SHA-256: 480fa3ae6664aaa2a504aae1a135b103738405a4474133e85008e39b8e9030cd

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