Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e730fd3507302f…

MALICIOUS

PDF

73.7 KB Created: 2021-07-03 11:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d02ca2863ea5ab34ee700395dc71512 SHA-1: 65fb30f9a5f2008b339d9ba3191bd100152e06a5 SHA-256: 26e730fd3507302fb67605a8dbeffbf76ecc18a92934c3a4306b25992a080666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lead users to phishing or malware distribution sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae4a88bdae1f17f39cedf7698d66d4b2/logogufazujos.pdf In PDF document text
    • http://gsxr.hu/userfiles/file/xobuxuvitoguzupuxagedika.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d42e1391e8f5c6b2a518f12b4aa88f61/puwupowaruwewotavobuj.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/h01lrojq5hjt5k1nvpni00ccqn/wobowekudetiriwatowikib.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dewaxugumipobakavetutasil.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/57684130552.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nufaxe.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a4d36c85581853214f91f1905d55a070/65877301476.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8hscciin64m52g8rt6j778tb8e/dafezoramajaxejej.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9f29ccb6---87837428452.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f95f8850c---pawadasifamixikofosodituf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b987d4c2265---fapujusivivus.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ed8b6f3555b010988b60b9e8466ba0b4/17595873092.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/22072956995.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/1971937149.pdfIn PDF document text
    • http://lblussana.it/images/file/jefunujovil.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/zigalixebixodumovi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72f00d50---rujoxujezuniku.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae6c9ecd8---fiputovuxokuzopinexog.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c3ca9c44---26708880876.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/semibinoz.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/88599405677.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/844b0dbffa486d6466e875b7885bc99a/zogolebogelovok.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b543dbbea---zikawibaruzeg.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e195a4d65---4753606249.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c774943ce9950e4d7778236b0cb5214c/kutavikamuzudujomig.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/gogizulefizit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=current+events+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 16200 bytes
SHA-256: 100f9f94c0a89c95a79df5c02dedd625aac272498bc5afe255caf2fcf427ed63
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10120 bytes
SHA-256: 2766ce9c35c0fd15822e6e090c9ed3c32c8ee6df9c8ff633554e068ff6fdff2a