Malicious PDF — malware analysis report

Static analysis result for SHA-256 f460ac61bc1f830d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 10:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77800247ab5e78ee017646cebe029109 SHA-1: 61387e0e8e5afdeefcf2e0258ec2c73cdcecf667 SHA-256: f460ac61bc1f830d86a824ae7a6894d54a5cd1901047541895bc05a55adb1e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=best+car+for+stunt+races PDF link annotation
    • http://24horasnoar.com.br/ckfinder/userfiles/files/bewuvo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/32159316150.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/79056100873.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f9d6e7ee---kubegubigades.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ribikupabajemosirikeze.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959843fa60---zosiwokufopuga.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/91667920120.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/96369089387.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/66653984790.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/foravefalafavis.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/24431661585.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/64944230361.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/tixegefogufuzo.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/mibisinevenuzalawuje.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/60359034469.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jalirodivuluwavata.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/tariwosoxuwa.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/26303068011.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792a5ff37---22353816419.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/sojagulepa.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/41330778257.pdfIn PDF document text
    • https://tempegaring.com/contents/files/22559483270.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210914/16315926303028.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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16048 bytes
SHA-256: 04771107a64541491adb8903f90a82ed4b89a0c0b8a65d0d843c7ed9febca238
font_02_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 10344 bytes
SHA-256: 20f65c42c22078de0013e871044db63822b6eeb693a9cc682c36d234bc977ede

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