Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcad7fd5f18e76f1…

MALICIOUS

PDF

81.9 KB Created: 2021-07-01 10:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e6a3f412fb5fef93a3fc9dc750437d9 SHA-1: 022d50fccb9be934258ece964672710d4e744552 SHA-256: bcad7fd5f18e76f170237b9a5b4a76b2bf5c90d47e65cc59a29f8e2071f1c531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scam-related. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://inwebjor.ru/uplcv?utm_term=dirty+text+messages+to+send+to+a+guy PDF link annotation
    • http://leaguengn.com/userfiles/file///27420962734.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/rinefemiduzubivasikumif.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/69578107720.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/70963455512.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a4fda27b---pibosuwafojetuzozo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/13445769747.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01c16c334---sofirigenosuguvugubeli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o9iqclhttumuohdhuea8njlja6/pikolodesumipof.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d124eb1a38---16136809315.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070713d3cee6---dekukagaxavoxovuduvoset.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b586acf3a---83838801049.pdfIn PDF document text
    • http://ekotronic.eu/files/file/fagixuluzuwevom.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3d4d1e4b422d4aa1bfd1f13600907fc7/wajirinidosabi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/858f60b1a7df5aadf3c52cdebd985ad6/62883829796.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76431d689---kajamefekuwawirodifupipo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/6017096695.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zivug.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021628182255.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kebidaf.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/41041dbb229f3ca5134c6da54c5cf49b/5148911196.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/35355957378.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/muresoxemumimefukifog.pdfIn PDF document text
    • https://actorconseil.com/files/file/bomer.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///56697598035.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee516e5dae---97962609292.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb82bc690---58818050094.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086925cdb75a---91617704174.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 17248 bytes
SHA-256: 0ec5302a6a5536add5ada30d349dbcf8bf8b7a961866d8c3187e5c9a867507fc
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 10860 bytes
SHA-256: aa2e0757db748daeedb9fcca733fafbbf1463edc166e086801b27b10a153ab37

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