Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f06a8286b12f95f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-03 16:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f1269d2d28f6df8614bb0e3f7c712f SHA-1: 5d1032803d810582e318745810f7d13d6555294e SHA-256: 9f06a8286b12f95f8fc4d9d42a3977afb299113d8176909e779e0aa7a12ab2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=parallel+dc+circuits+worksheet+answers PDF link annotation
    • https://edusfera.pl/upload/file/rarusaxixajusoli.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b8604dd1340d5036e133da50e05b61ce/lazizoxawoxevalufezifi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/73943031004.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2987038d19bd679d19875d6cfd3521ce/bubunapi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c6304bc8---suketubefi.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/96953973718.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/97003407750.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d93afeaf1d2---nujunimirilajakapexegiv.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/98278397309.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15aad3784a---61797881478.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/31615829359.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/51404674176.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/mitovifanivasole.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/75615661925.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f1f3d587f---22465185919.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f2359e7f---14892156827.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992276ebe55---87476795544.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dls3odcsmvnpsrh4rq9ob0thbq/buralaxe.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05feee5779---93426410011.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/torebedumukekavinakeva.pdfIn PDF document text
    • http://aa-nusd.jp/47346224929.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d2afa54491c---fitefavapogatedofaxatusij.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4bu244bb3ftid3ps14olk9csjn/golufojekunasosegoroka.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082542f57774---24172172200.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/83436075307.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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10748 bytes
SHA-256: 3b7826d0a48ff14d9f7e7390d23f88cb61ca0523357a635882de6d57f035da59
font_01_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 19436 bytes
SHA-256: 4d031c14b2c1fc2d74e6f727e3f4be120bc5056e484109f6e27e3aa93e406486
font_02_sfnt_off00014338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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