Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c07441cb68f6ec…

MALICIOUS

PDF

82.6 KB Created: 2021-08-31 11:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 79c892f786438a12eff8d12e814abb4a SHA-1: b7c129ce9e979e1cd12a20c52acd1b75ef032797 SHA-256: f5c07441cb68f6ec41017aaad5d71b2a43170820c45bd6927c8be7e547928850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cornerstonelaw.eu/userfiles//file/vupanibopofamotavodefupu.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ees9aa8q5jjsmk2q1pheg8u0l4/bovefuzanunafikeromapi.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/talutibenowonetamozuj.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/nuxidunonifevixuxopabin.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/25a88fe7acc207b23274681d16ce4eed/kefabuvizebunab.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wexut.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9366d580b548a9f3d8ad37684d112ed7/lawewufutogofufisikipid.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/dubepuruxozasesa.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16286085591777.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/48054491350.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/jolasozovipizofiro.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/31928968751.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffb886615---zojiwogasigigig.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee5f7c405---54942980449.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108021824511413.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/68587797534.pdfIn PDF document text
    • https://tonitomov.com/picture/file/lezuxarake.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4004eeb1---31763219728.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n8254lc72uf8l9o86fd4rrt1f4/binaxivoner.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lirakuxelunironud.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/53657258675.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/32284049666.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ec1240b6b8001188f58e8c5cd4f0a6f3/jogepekijotenuba.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegagijewobeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=claim+management+meaningPDF 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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16732 bytes
SHA-256: 356947fd6af62821d627b460d28e6af910e1586ac5d491be3c2740be6c1e4a2b
font_01_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 10092 bytes
SHA-256: f2b3356bf90921616687887ad47b1ff0689e5c19c6b85d5aa5e151bf62742395
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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