Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb55c3f6e955d45…

MALICIOUS

PDF

78.2 KB Created: 2021-07-13 18:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b39970a3aea542be33ab222812c8bc73 SHA-1: ea7f38b3a979713a7d1fac16da67079d6eb9d514 SHA-256: 3eb55c3f6e955d4572ab3babec1b74e8b701c2b43203365d4c7962dcdb724e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous links to potentially malicious URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a9a6723b380f677dfcb6bd9ce9a763b6/xevakariwonajaj.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335e2a3698---xuwibesapaz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/715cf4992fdbd234e86548ab0ef46a60/lekaxel.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cansr4odiiunbej7biqa2d8gpc/61120313846.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/63590721949.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/57068353384.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10c70c0fe---55212086684.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6b2b7053a4cd8c130b1875c0913e1f24/kesopiruzesemesoloxosoje.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521001205723463.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b6f6c833---48247733834.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/ritujatimeferonozev.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/vopewojaru.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a87d7d465ba438996563831e84ccbafc/47787580640.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/77750160167.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/jakovovowiv.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/be13087983d96d3abc62680d8561ba38/rezoxogudo.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/33148666792.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nerurubanisivurale.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/23842510643.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/legigadat.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082723530b3c---xemezuwizepivamu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb4f646a5---sasot.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bokazawufalirubixafijop.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094173849169---8057200569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=10th+standard+ncert+geography+textbookPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c7c20052---xiguzopexovulavoda.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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 16460 bytes
SHA-256: 679d92f3fa8ad5cd10d0db0232a7e67f9705cab218bef4bf0a6d09931a6cfb50
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 11180 bytes
SHA-256: 57e28402fe00a6e1c46701583e86b25856eed829dd37b6b99a33fcef6959d939
font_02_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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