Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6ee9fef2a7e778…

MALICIOUS

PDF

87.4 KB Created: 2021-07-19 21:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cbf7f63718e9984d707668fbc44bd29e SHA-1: 32c83533853151aa48f629844c67bc5e421e417a SHA-256: ec6ee9fef2a7e77804ed6af3ca4a468a257d21c8380dc602148e1b54095a70cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/670e668feb160da6a80ae6c9e9995d64/18337589402.pdf In PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/bexiwatevuxojikagali.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57923985595.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/42274690495.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gitabubatarixenewusitobed.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba4724f97---60351508065.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6c06fab916c21f16b763170d0871ad3d/bozaz.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kefirurefeso.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544c42eab2---41284459329.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/70766524353.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kofigodabefifepufufev.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2372d0427---2746348639.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/54759625069.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/36071917711.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/posigi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5bbab00d0---85387175773.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nitunizusowosopika.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/vudevisag.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7f9f65d22c5f65d726e97e200dbb34d9/wunoxejoketuzid.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6pvut60ipdhsd8e8rbmja41ic0/11045355155.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fb4022b77---jafoferudetu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724044351a---rotujulojogalasisap.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d48e8a869f6bc09cd5b3257c598d6055/veluwejelakanetito.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kepevilabikovifuzeloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=memes+about+businessPDF 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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16904 bytes
SHA-256: eee99d9611bc6fa10c57c33d1ddcaced57919a6c3afa2b4ed47bb9d0a0b9c5dd
font_01_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 10356 bytes
SHA-256: 71d0d50006d5bc27dba32569d2090c69deb96d25f01be95b28804b7e07212e7f
font_02_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1