Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2eeb7928651024a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 11:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6b89d34d2f33e2dc347c4dec5f4f83d SHA-1: aa72af757a9f1ddc5189ae0265ca3afa1ab16274 SHA-256: a2eeb7928651024a2e03e8a4aaaeb7dddc616b797d67dcf81ea28d1ddc678c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristic firings strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eda43e677c6---78433753285.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/49272059992.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/23179938688.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/75455236072.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ef554bb---20196424375.pdfIn PDF document text
    • https://basisangka.com/contents/files/balezojibugurobibop.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210607_EEBF835A87FCFAF7.pdfIn PDF document text
    • http://geose.ru/userfiles/file/71052765666.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/18ttjvktpbd459177isee0joc1/3679632563.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf954d3d6---jotifixoxuborezosabu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607428854e074---kovubuwusoge.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5b2c1d1f25d398752691d90e7a721a6a/33093897605.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/12720835384.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/33165936763.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hvb8tclauvph1buj65i0086t23/rewoxawirus.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16120e1fd4bff9---tixesoxepomezux.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/elueo120j0o2mmhbi8p0q8hr77/ponojukazilasaji.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mekolusimata.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea22db272aa45a56c9df5c12b24de054/24312200482.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/39419968700.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/44192734168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=virtual+dj+pro+7+manual+pdf+downloadPDF 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10696 bytes
SHA-256: d0d81f2adf46500215a910c4f39109eeb424a71f0f031b51ec028e42b38baa8c
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 19992 bytes
SHA-256: 773b8317fc89cc82b72e0ac76d86c54f3370d6e739cc14695450df3f887b2a80

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