Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c7ceb6d27cd4dc…

MALICIOUS

PDF

76.8 KB Created: 2021-06-26 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c47c9493d31c562ac7d482e0bf507d9 SHA-1: ac699b66efc9e3d3aab85804db5210a99f0765da SHA-256: a6c7ceb6d27cd4dcf2524e42c645d6a4afe7da4bd9bad8a7eca0cdc21af4432d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=options+futures+and+other+derivatives+solutions+manual+10th+edition+pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b5b92a6---66869673526.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f623185c---fanigomufowedusediduge.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/dc7282b39d10712393edec5deb039270/19083470233.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3ee0792d6e47dc57fb3259102d31c4bc/demazuwuzenufib.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/42dd7521053d83bf8434eed43c16c22e/nisimidupif.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/8458162394.pdf
    • https://vansuloi.com/uploads/userfiles/file/83263858037.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7d58dedb---vogoporetepufiserezuju.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e976c7f272ab0d5cbea0a1a3e18eb86c/gunepexirumivugibuzo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779580901b8---17269378037.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609b335e1076b---gegilagizosek.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dulggvocsm9hot8b9oquuar4at/burozi.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f537200858---2767283416.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jmhoqmkkqoc4993csmsced1c56/zemibetosugisosugesere.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609220570774d---47394106560.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e2ec013---32023520385.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/veeduf2rtc6sverquc68jbh234/fitikowulogugizodofubesor.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4f21c628---13370453577.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0128e66cf0---64719167277.pdf
    • https://szud94.hu/img/sajatfile/files/xigadata.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/65d6l7brb1nc7cm4p22gbmb5dt/powiwemodijemixelagi.pdf
    • http://allycatering.com/userfiles/gonupafumosuzulode.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f5.bin
9b4ae36a4de6c429f43675732a414fea3a605ef32f0263f6b774335a9334ceb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 11128 bytes
font_01_sfnt_off0000dfc3.bin
4e90918a985001c34fbfd0f277ae68cac805cd86b613eb32f4f5c30c089bb9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 17408 bytes
font_02_sfnt_off00010d5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes

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