Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b483ee20f8c4f93…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 15:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6102a8ef42240e1d2db5ca438b06a42c SHA-1: de7b4f2b1a4065e29dd479b13c2def38149e0090 SHA-256: 9b483ee20f8c4f93ea01d976090a876d4016d8d473e75b36643817719f5bb846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=physics+igcse+textbook+pdf PDF link annotation
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/81192421660.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pufuvobapogoxijowavexe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1bcbea6ebad634cd8b17e6fed95bfc2a/sanepoxopedimerix.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/81578536540.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/dotudivefamimorale.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161438b7631bc4---mapurumanodijubo.pdfIn PDF document text
    • https://clinicscrm.com/img/files/legagaserav.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/7063025069.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e3e816b80c3dc1982b1e65112aca5655/mozupeviba.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/dubufo.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/75747829671.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/sudovejifa.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/tugetigojikutumebokesife.pdfIn PDF document text
    • https://maviet.vn/upload/files/70045375248.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/busekobebibozobalifonoteb.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161322d619ea06---rukix.pdfIn PDF document text
    • http://gojjang.com/uploads/files/12588000496.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614089050c983---zuxetuvoluwesoto.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/woxabagumuvowero.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/12949952693.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jobugivegadorirakudavev.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/38901534926.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/38769090209.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408ff84a2a8---13134524557.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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 16480 bytes
SHA-256: ed4a82c12ada5779bc160bfb34c354f455c63ec8f7f38ddee3e1cc80ff5d23a0
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10936 bytes
SHA-256: c5af2961d6ce283efd1d489f3d0612e8d7d4dfe14e3c83ce6fc1a86ac8158582
font_02_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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