Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7924b8d1895e12…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 12:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ba53d63117845715a8560775d9019e6 SHA-1: edec8b2ef8376c6fd2dd04cb2d27a7e7a682a860 SHA-256: 6c7924b8d1895e12acdb114c38f0f23ae03dca74b07153f00f77af832d37e507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e50c23c8ce93538ad9dc6226aab4fe49/51571240056.pdf In PDF document text
    • http://mabo-meccanica.eu/userfiles/files/17565036784.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/zijipozinit.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5ed029f2---gawatirusufevopavu.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/61236613060.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/fabukotuwij.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a6de401ea---roditepukuranukiwa.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/75843785956.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/71b45a66f040ca2d83970efdf7d0e493/77703698912.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/je0akodqvfotj4vnrd34rle782/zakemadojivipuli.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/gejumobo.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/99610947845.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/tezakavekoda.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096190faae9d---dopex.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/jetubikix.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b289128193---tupolumumowamaw.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/kegufurunaj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612070f3e6c0e---wivalinojo.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xaganuvafepevolimigikef.pdfIn PDF document text
    • http://cristalensi.com/public/File/wekisa.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zozijodinefozariru.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/56942184326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+text+to+pdf+unixPDF 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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 10412 bytes
SHA-256: 53f95912fdbc00494e7ba43ef8d6c56f81bcd70bd6687e595e2145beac3e71ee
font_01_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16900 bytes
SHA-256: af7f6206d572f36b8333617cca4f4a25efbe85386bc7d705f5dd22ae6fdb724e
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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