Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5f21089d46b68c…

MALICIOUS

PDF

107.5 KB Created: 2021-09-08 07:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaf5a54f57297363a839098eef88f519 SHA-1: ee7529d0c883b837c0e427d9f0d5da2f92858d64 SHA-256: bf5f21089d46b68cb4cc550b0389c5c504a6d4c36f0434e10f42b3fb9eb84059
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934b5ab4bc5---78518272210.pdf In PDF document text
    • https://deltagroup.bg/uploads/file/81181626762.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076418a81b2e---vasufutowi.pdfIn PDF document text
    • https://blokhol.com/upload/files/gaweb.pdfIn PDF document text
    • https://saam.vn/images/content/file/44884937016.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eb119981c038b2bd72bf2e464eb397fc/zilizurokoni.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fbd588ce42437687f0828a1f6e13b885/94033304264.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/ratasajilazix.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/ramipupatiranagepuxufudam.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/xudegikavoxejumi.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/35277770611.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7eb81f0cb---11125259613.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7c64bf2fb44915433d6d5f4e846d07ac/xigikofasuselot.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2e60c2c5---jawaduxilaxewelaparupifi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zumanupizulezuwipijesefep.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2feb979ac8---vomajeridadenub.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/setabexefelefez.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/089531e3419bfdcda4be709483e2c96c/xubepafuxowukagema.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/90133676824.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xutebuvixivo.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901042114.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/11397691814.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/6969962540.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/1434311296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=carbatec+jointer+manualPDF 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_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15523 19572 bytes
SHA-256: 95401a6300adf4ded81b0bae5aa3c1856d7c607cfc0d8d0272a42f13ce7b72dc
font_02_sfnt_off0001885e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1885E 10624 bytes
SHA-256: 6579d9e41efa3e6b88234751e84aae4b00f8ea5e2e985bbbcd6f79c6b6680454

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