Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b85316cdab9ea73…

MALICIOUS

PDF

72.6 KB Created: 2021-06-29 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf1e4e61d34955074ed8e48802fc4854 SHA-1: f7d4f9d74cada17a24955a1cec41f67e6291a95d SHA-256: 3b85316cdab9ea73abce031556b1b06dbd06f4c62396e59aafb3f9bb1017d0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a04ea2b8---kiremik.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3931e1263---9668623138.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/ririwisoba.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zaxukokuxa.pdfIn PDF document text
    • http://falerisztika.hu/tmp/4693459142.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/83938769592.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/bifame.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/lapag.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9b657f1d---goxusemifotixex.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/87584608785.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/57553918444.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/46814212323.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f87a6bhkvh8llv843fiaasm8ug/nizupisom.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/80352784494.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/32187248859.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076efa53cd50---manuruwakoji.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93811f24c---dexovipes.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3fdbd798e2b66f871e1e04c4d9dc8a96/jitegokogibovixitizumu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d350076d7c1---9135016050.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d8afa8d224223e054c51897b93ffce9f/21537475520.pdfIn PDF document text
    • https://aspirans.com/files/file/80254523005.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b12d86c14b407fcbfc71ded56516e7e8/37745078440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=moomba+owners+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_off0000bb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 10400 bytes
SHA-256: 2c528b45a5bf5de435f8551e9352a7fbd939f2c2297c4685a1d0e597fdf22d87
font_01_sfnt_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 16364 bytes
SHA-256: c05c0ec4bee40d0f6f9819f6c43df8eb01bbf55d2feb6361394dceef3777007e
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1