Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ba6241e289fa6b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 20:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a83cad3ca191b427701be1b4b84593da SHA-1: 28364fc91c686bf4ef9f09e9827c76064bc3fbdc SHA-256: 98ba6241e289fa6b2dd0ce87e02be5c3615cbd53b926e1ead2399805add02912
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://casabresciani.it/uploads/file/mufaku.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210701185459_pm6f5m.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/safowijokotokosalogexiga.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c471675da06---risejabipunofefu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14b022a55f---10448361389.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/nejosovebazifoxexilojeme.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d460cfe5b---96109255256.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jorofo.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5b8d63e750b70de9f21387e7af250bbf/golokisonuga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dakagb9hbhj27grg576mf2c8r2/52885216272.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/geguligupororonaz.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kt3lq5derfrebsl5r7kiujfep5/nutamojalarezetemek.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071604787882---lawaxiw.pdfIn PDF document text
    • http://4bx.pl/public/file/wogidozojo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/28575705171.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b57537a9fa9cd65c7d350ac3f95e5a06/sudozelun.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792df120995---95993609991.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eba8a73481---73564938343.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/felgkqinco8ls6sdosf3ffn9j4/wogarowowazaridapal.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/j3vk0itn092vg25e00qcu6546d/29463997732.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066282e08b5---xikegitoboratoxabikiliroz.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/44187175099.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/noxukitukuk.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/bkbjcc6em7dam4s2854h2a5bl6/91490726108.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/doxurukapizet.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/koripoteg.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/31098874662.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd223b1bd5f---8168741390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=iit+jam+mathematics+syllabus+2020+pdf+downloadPDF 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_off0000c1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EF 16960 bytes
SHA-256: 1bb0142165c9636154a4d41c3e45c38e32de246f7e718a37881c755b8e6ae486
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 11548 bytes
SHA-256: d0ed3ea1e711c82cd122aa6ea32deee8b107d87f93e8b9941bb5ca784b0ab2bd
font_02_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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