Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b72fbcc7e0dad0…

MALICIOUS

PDF

95.4 KB Created: 2021-09-08 02:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c18d75955ce7ff4fc1e58ea048690fa9 SHA-1: 01efa4c3601441e1b43dc43b4e46664cc529eff5 SHA-256: e9b72fbcc7e0dad04d484ffa2bfdf467b7128172cea7b005a1cd8cfb83e995f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=krautkramer+dms+2e+manual PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613264ab6982e---92895793540.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2db86688cf---tojak.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3405c60f89---91468902949.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609975e50fb83---10818451396.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/daramixiretukeneso.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d478293728e---68992362934.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/19928484380.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908031653.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a93e8f7b7---61154332683.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/todeduvenube.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/35664230882.pdfIn PDF document text
    • http://fygl.net/uploads/file/180342196033.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/wivom.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72cf35f226---kuzugejobimafudivigagomo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8e2e578c84ff07a0bb08ae21bad5dad0/mosekiniruribigup.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/femizixipepaxa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a71653bf6da625f35c40dd21bc18dbff/wudebipubizid.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d75277d6---1198827122.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/75892859273.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22c0c683e---49761140933.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba13c7f35---gowasabujok.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/tonivufivegajifiwijad.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/tidojojepi.pdfIn PDF document text
    • https://superpart.com/files/mazut.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69681220916.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/25187767843.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_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 10500 bytes
SHA-256: a56f3647e39918145d77108a48a1ae28dca28482154eac154460c901e8b8deb8
font_01_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 19048 bytes
SHA-256: 06940ebe1fe60c0e651ba6f2b9e3a02b8d55f9418d3233bb629bd346791d6d39

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