Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c80b5c07031beff…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5eee541b7c183e225604ccb28b2d8c8 SHA-1: 63699c14daf70a3f804e9b00fb3268748f4bbb7f SHA-256: 5c80b5c07031beff03e9eb73e5b39f6e8b52286198aba7138407b6a5c34402b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate this is a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=como+elaborar+fichas+de+trabajo+pdf
    • http://mateuszkucharski.pl/admin/file/fozuxuxezis.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/7767970790.pdf
    • http://cameradungphat.com/uploads/files/86785878329.pdf
    • http://agcslohian.com/userfiles/file/xekivonujemuwav.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e78f0ad72---60177627192.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f3caac393836179906f919faa3bb5c30/gufefumofam.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1995305c58---68986751348.pdf
    • https://ego-sofa.tw/uploads//files/202108130104091564.pdf
    • https://cochleartudaskozpont.hu/files/pawoni.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/71502504187.pdf
    • http://fujavietnam.com/images/Download/sarulaxatudekabokidov.pdf
    • https://ost-fogging.com/upload/files/sozesoxowenolalat.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/jevovezubirago.pdf
    • http://winso.tw/userfiles/file/52713265920.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b67dc85e638ca88720b6c97abc63db04/raninulelevovak.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec58043faf---gezamiwefojemix.pdf
    • http://greenbrier101.com/userimages/89199356685.pdf
    • http://cathugo.de/res/wysiwyg/file/nobosemuvorulazipuvo.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0t6pbtorf4beqenaq599k5p62u/jenesosug.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f29a467e---72751856959.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6a7eb2f0---3322597429.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_off0000d91b.bin
ce7413898cbfa04b6539665f5ff498f605aac63ccd00bfc7b5ff3b1d9499130d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 11080 bytes
font_01_sfnt_off0000f2af.bin
4bbbec2514be876697650dd73479bfe0cb561e0283201d200d712dcfc107cda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 18336 bytes
font_02_sfnt_off00012152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16792 bytes

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