Malicious PDF — malware analysis report

Static analysis result for SHA-256 933704dee506d454…

MALICIOUS

PDF

101.9 KB Created: 2021-06-29 14:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb764502c314b2cf6c26a72248da8100 SHA-1: 508ef4e55aa4d0586cab147dc679febd72c9ffc4 SHA-256: 933704dee506d454d9177801fe1688110f6cf52a233c066a45ad5a74ca652579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious domains. The presence of numerous external URIs and the ML classifier's high confidence score support the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bancodevida.com/bancodevida/admin/images/image/file/2230439164.pdf In PDF document text
    • https://deltarealestate-eg.com/userfiles/file/15468215666.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/muvukiximagamazegisobi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f88b9e9---64559644126.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c59573914e1---dijojotodowo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d43f39b0d---25999818208.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/lotiwuzixonuzupeki.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8e39lkbo75v5hoo77svgm7a4d1/vuxonezidodigo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376909a70---98611945637.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3919697e7e605a720123a3790466b2ac/60584780494.pdfIn PDF document text
    • http://kotolantopeni.cz/file/48426424754.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160be08c8e44eb---75283835201.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/82986636383.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/40642162655.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a358ec0195a9cb665d25e20629310549/xumawekijapubixe.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609227c45b257---sazegininujasiluzufeba.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71f75932f---26297325500.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e10ad0a54---841632490.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cc7acd12c134246de277e26e273bed74/94170042428.pdfIn PDF document text
    • http://stl-hk.net/userfiles/vofodotaxodasemila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+sell+a+property+back+to+the+bank+in+monopolyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17956 bytes
SHA-256: 1f51e595b2daf62c1b2f6ce0db195c8bca16b8c1e5e06f6a023971d566e2cb70
font_01_sfnt_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 16768 bytes
SHA-256: 2a5fd277f4f5031a4d9d967e559d8dcad7ef61ae45699fc59a954ca00f60bfea
font_02_sfnt_off00015802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15802 11116 bytes
SHA-256: abb810ce3e78284808f5c20d451b2dc138b0cd9ba5fed30dd41ca7a4e02d55da
font_03_sfnt_off0001719d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1719D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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