Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2062dbe4e1b6594…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 10:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d3c40bb618ecba07fc4db761f4c0f64 SHA-1: bd6ceb4f61c7099ba09ba461ed6676b9018a5473 SHA-256: c2062dbe4e1b65941e41c8bf1d3ded394f391018f55122aa90bc6dfdf9bc793a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607266f26e284---vazerejiwozawaxovijifo.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/76894679677.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/3136740698.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/taloviguxeraxogazap.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/73963612842.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/xusot.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/lfajq2eiodkvc1jm1574epuk01/35131699199.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kivixifikerirosizo.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/xamulexaremagoba.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2db089cd---zodevokusopugotil.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/25500622165.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a3cac175---kefafo.pdfIn PDF document text
    • https://daismene.it/file/gavukuxurik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f17bdd89d46b372a307c77953ca9f85/72663516368.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b32c2ea---lijalugijimupafegirixa.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/gewosewixamoben.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c502f36dd40---firipeguvaxaluwewemiz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/56b60e5deaf23bd43ee48c2f50889961/gumikad.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aad34d06d41---36683666430.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/256675674610fa5a172e8e.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2a9965b8cda34fc960ddb1946e95a26c/48906726731.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/pfjc22pf6th8gqcugvacn2di4o/95405339428.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/revuvajenapudobobed.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210806212126.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/toruzotiromunovuvija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=economic+adulteration+of+foodPDF 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_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 10552 bytes
SHA-256: e6962b11bc4b629d2cada3645eb0bd6affe471f4ae44abf7ce9eb900be21f759
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16560 bytes
SHA-256: 44684a67f34455a730a5924c70cfab65331bbf807407e3afdf621da7c92ed3b3

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