Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd9b688890873ac…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 09:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64640dd1f04b74e6da072b8f32ee25ed SHA-1: d1b0a6e57c45b20bfb2c20a9880d72582f4d1dee SHA-256: fcd9b688890873acfc5fc08b648a93290b017eacf4a779e25d4558e6d4077016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 on compromised CMS uploads, pointing to multiple PDF files hosted on various domains. The presence of external URIs and a link farm suggests the document's primary purpose is to redirect users to potentially harmful external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4f689179---22408263526.pdf In PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/3668511056.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xiruxepogekisaxipixituv.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/nejifeva.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/furax.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/getipugotisiwejolu.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/gipakug.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d1d1ed89e0ebf3b80c14ce35c90c0c29/vemujifomi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/wumavetafawob.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/ligafo.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/mogedo.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/dodizetozudavafazun.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/36551050071.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/72720138302.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/sifudasoxarebetopilimok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba113394c---guvetazusinovo.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/37048019942.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/nofulaxixukukakutexuv.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fcd43ede---xukobetokesom.pdfIn PDF document text
    • https://songhongresort.com/img/files/pinoforez.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/bawanerosanime.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/13970131656.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161387a85625fc---mijorupivelo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/79904747681.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/54827087508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tv+android+app+freePDF 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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 10208 bytes
SHA-256: 667ebee8f738f63a5bcbb35b6a58ee6dbe0570fa93adfff6e2fe8f58ceb2ae04
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16448 bytes
SHA-256: 96a9c03220553926591de5c9433225c898d56c45eb40077041c9a3ddff0388cf

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