Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1901fceef3d260c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 02:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ef68d296ca86483f01bdf6e86ae9ceb SHA-1: 4b0e4ac1b21cef50c2a982fcd2a8ad9e7acc2e4b SHA-256: c1901fceef3d260c53842537e3322eeb5ac118283faebde8b4bd68427f203aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms or compromised CMS uploads. 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 embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=genshin+free+wishes+code PDF link annotation
    • https://restavracia02.com/userfiles/file/jofubowulumuwaxibi.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/monolisupop.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/84532336901.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/34717167209.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/60166466992.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c70838f21f305cd3dd8355e8e2925c58/vitog.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18279631423.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/ponisifomebifogitode.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/20608803031.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sakatabizobaletufowumir.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161318742e46f7---muluvuvadojifezujupafi.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/aa7480af0a0d906cb1d75eb6f6da7ee2.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/97002072648.pdfIn PDF document text
    • http://torgoborud.org/images/file/73935445805.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/nojagulazeminomisovikobax.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xozewonapilusofafuvido.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/mowadise.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/26031956568.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d4rcsft3vdouur6bqsvqkmbs92/6448798031.pdfIn PDF document text
    • http://hmed.vn/upload/files/rixepup.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/kevasawasurafobugesijit.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b60ca981a---juxizifarilinojip.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4cd64a6b---punuwodij.pdfIn PDF document text
    • http://armanetti.com/images/82981326501.pdfIn PDF document text
    • http://tencanpowder.com/d/files/pibezejas.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rusawatusuposotilubi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913135157110697.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 18732 bytes
SHA-256: fad20743093d54ec310fd95f9c79c7a1e4aa1656dc45f02cdbd6797c135f04d5
font_01_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10392 bytes
SHA-256: 831babad49ba11fab28392a2d656fc17ba05b2276e7ad6ca60bdd0548f49be5d
font_02_sfnt_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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