Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eb7e8a973e529f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 06:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7b7f84d527bae1ce68e219551868b16 SHA-1: cc9d6ee13f0903d67183a18d518bae5ae8e5a99b SHA-256: 37eb7e8a973e529fa6fcad99aa0a89ff2423c0f1b1d6e592c8e091bfa752f2fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious websites. The presence of a link farm on disposable hosting further supports its use in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=reproduction+in+flowering+plants+pdf PDF link annotation
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/49c6f0e12b7269eb1ed2ba3cb391926f/95421148855.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rupapemudekobujano.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77cf404e7---jetanegimu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/diwerawujitiwexarazeji.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89db4e4c01---86429973570.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/xejizisizutezefewajaxe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/akluu7qm8nnh36c84uojlr3sa1/14843134209.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/63ba842d14df684237772b1f82c8f535/39052346047.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nggp3qlpn25otc3aqkkq26d0qs/88245589243.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210624030925.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/11ca961cb006b6c2f20119f4d247f93a/nunedale.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210619_092905.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/fibemiwaj.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081e56be7c55---gakutun.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4303a0c7e5162852f83c60351b6fdb98/gudipevipunawebitev.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a429b3d4d9c---beruwi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ecd7311d33f6566ae7fd9c948950ad75/ludebafapitagawusuw.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/khc6fqdunboplsc2hb2381ot9a/dipat.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a68c56faa---daposuf.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/manovosoz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f24082a5---dudosotozi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6b0647129ece05ef73a0e219ec0ca267/lerowugesunada.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_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 11024 bytes
SHA-256: a62ea51f2eb46963542fd9188615faaee1af21dfaa75cb644a72d77fcc952e78
font_01_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 16652 bytes
SHA-256: 33cff80b06f937f23d5c8daf2986263869f04e0fff784cd7323e1c55a7889aa1
font_02_sfnt_off00013dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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