Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ab11001c20fac9…

MALICIOUS

PDF

81.3 KB Created: 2021-06-27 21:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 823643028e0973e3cabcddb5f5bcd9bf SHA-1: dc93ac304261404392cfbfc2e685f194f37ba996 SHA-256: 51ab11001c20fac9d6d7450e44a839e622944148b86baa92928dfad20493bcf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised WordPress upload directories suggests an attempt to distribute malicious files. The file is likely part of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b86aa4a6802---66616278531.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca892983f---16790136332.pdf
    • https://balajitutorial.com/admin/userfiles/file/vemarodosewixi.pdf
    • https://dejavuruse.com/userfiles/file/79436471749.pdf
    • http://aexpress.lv/index/images/up/file/55587935105.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dn5fmtsl5s0l97hkbkbhhof2da/81588797797.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ti5v8s9jsunhvnvev1a1fc0he5/49566355253.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014186c264---38930216494.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b499c733ef8---bixilovus.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370ed55647---mugutinunufanepexobowar.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c09fd4dc88e17bb28f6a4aad32f9eb1c/44089413828.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4b465c2b---32792190590.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/54n5sorc33k7uk0sd2qurin6uh/xivopesolasuraxusigomojom.pdf
    • https://kar360.com/resimler/files/nifipawasu.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62cb4d77f2eaab8bb47d1d7b2a7cd9d5/ridexetaxamosokoju.pdf
    • https://zlatartopalovic.rs//files/retitunurivoden.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2p639fiutjk67g862mce4afhdd/81852478552.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe5043a019ab350679a253fd565b6f78/31188679366.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a302bbf8b6b65fa601f1c1c4f0d0bb71/76868318833.pdf
    • https://batikatravels.com/userfiles/file/sipuzabulodovologe.pdf
    • http://goodwill.as/userfiles/file/genodejibu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tell+me+about+yourself+for+sales+job
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc8.bin
121cea4f1b238ee5d28c5955f6da21efe5222cf60d8ebe7a21c2d3c3d6ec7df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10628 bytes
font_01_sfnt_off0000f439.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 16792 bytes
font_02_sfnt_off00010c4b.bin
89ce0d9b6c7219510feae303ec6a8338bd4e8bf8fce35f948c0a09b8a429a255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 17160 bytes

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