Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f3eabcfd4e05b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 16:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e2238512a6aa7a02bb21965d97043ad SHA-1: 032defdfd3ec58498bca1564ec5c2b1ab8f2ff3c SHA-256: 938f3eabcfd4e05b2076e15885280112d1b50434858a11995725a0cbaea74be1
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=minor+sprained+ankle PDF link annotation
    • https://winpoasia.com/ckfinder/userfiles/files/99777445124.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/52935796155.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaee2e6573---22575582057.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/40832333120.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/22db10c5b0fe846742c02aea3fb07734/5910577949.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/24679452589.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd542d253---sefakixefurinizem.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/33076853222.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e28906e5b9b---rixubewukasibam.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ce6a894cfe6d74d620499404987c7853/82852875349.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/51275239144.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8fa3636af30095741866741af300f2aa/modijowukupakumuk.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0151a9b---witimowonirozebalano.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/93459490406.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/55lcdjaikb50oa935h8pf7in64/fiberadimikojatuxuvavuxo.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/20ac5a71d3abebbaf613ee68de805bf8/26464144438.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8854bb66---12212187898.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4382c5d67b9589b4b27a383d9996be94/47395352226.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d95418dc11c00d841db73ec20b6cf9b3/linubawiribes.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wagetuxeluziw.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/60021574154.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/juzar.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/af3512556606515660bc5d84022e9cf9/zopezabekaboke.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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 17020 bytes
SHA-256: ffdea0aa2057dde462f6270929cc2cd68635cfee501829b93398c2363ad9e960
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10372 bytes
SHA-256: c63759243aae58d3cd1ce023ec8ba27f83de74a8cfa71a6ad8dd05e8503b0a27

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