Malicious PDF — malware analysis report

Static analysis result for SHA-256 da92cb052c57051d…

MALICIOUS

PDF

96.5 KB Created: 2021-07-29 18:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bed3b3a1b128578bfad544674a99354e SHA-1: 54262271c4c6854c0559e25007ab238083cf3ba7 SHA-256: da92cb052c57051d0f8f3f49da18d28b13efc7a36a9a0a10fb5ae547433aed8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d7c9c3qgr7b03e4rfnfueagcl0/20531905273.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa5fee201---kiwizuriken.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/79756645d63eadbb284542fec10027ff/dovaje.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/bawugesutikozesajefi.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/40481457409.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608026645c1f2---93335444943.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80e855767---7631485483.pdfIn PDF document text
    • https://atl-50.com/files/file/34153206299.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/949b51fd1b294ae9c1d9ed0fd87e2b94/naguzibuse.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bbabbb92a---51739899538.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/tameribikik.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/20f6cdc3d3310916acada020441c837c/8403307212.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/41002999569.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680c15ff66---98301538225.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/61391607072.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/jewuvorumev.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/12668234991.pdfIn PDF document text
    • http://vodova51-53.cz/files/48981340237.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7uvshvbdg9qe3q74u5ibgbdbt7/14499428101.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/21581782261.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c98f94bf650ccb9d7093267ae9e0653/wizetetovijowuv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6312d2c6f5---posovof.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f53bc588---216355696.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806971645d1---laritovesolowewuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fm+whatsapp+2+apk+download+latest+version+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 11120 bytes
SHA-256: 4e390c06fd300d2466e0774f355d6c7f313b40ac6310ad757e5b234e84fab1f4
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001459a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 17276 bytes
SHA-256: 668f92194cc910599d4325b38758b61882c4b255781c9e3093688247d88a0ae5

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