Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef9458d5917b2f1…

MALICIOUS

PDF

80.8 KB Created: 2021-07-13 07:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e5035b8b8037fd4dc2cf2d6b89cf228b SHA-1: ac6e920f9a8accc76ffd9134ed7a968861fe74ee SHA-256: 6ef9458d5917b2f16efc2ac0bc43c34127689f57f0463a823c3afc1e5783671a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates a phishing pretext, likely to trick users into downloading the linked PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1bbf68d71b06a646df3e6072bb457b1b/woxoduf.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ekpjigotvoi2hqvo3bj3s7lvo0/noreve.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776794b1231---37834698558.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/381a3d65db851208fb07dff0f4d066e6/67900703313.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b08f1569f---xometi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/1121494059.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/80401229559.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/73551411792.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/kamivitozoxexaviwozowukud.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/wufoputip.pdfIn PDF document text
    • http://bienbao.org/uploads/files/nodopadunezodafikip.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/vojux.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/41701351389.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/44b84ee6fd94bbfa1ab727d98e7989aa/20496678385.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/56labhj4tv4jjmthk1kad0v3h0/9862972416.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/52805727022.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f1a494cd---wuverav.pdfIn PDF document text
    • https://mavibusiness.it/file/82689675582.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/61155936348.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4933c78bf4---22213244828.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/doromawafa.pdfIn PDF document text
    • https://gilbertems.com/videos/file/zapalaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tired+and+aching+all+overPDF 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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 10412 bytes
SHA-256: 232b8a60c7380c7db593550fd6d9ef1e8046f3907ed6e630a0ec1ab1bf2e0fd1
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16764 bytes
SHA-256: e227a8ff946ea7588841319719d9b8406750a325df07e389cb73b8c8bf8e444b
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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