Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9d6959c966389e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-20 17:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5b0b9d77c29d5f572354118bae79aa4 SHA-1: bf98e881f94f08cf7ac12edb638569adfbb339e9 SHA-256: 8d9d6959c966389e11387ab93c7b8e3bcd05ff992559d2d8f7b2d0bee8dee91f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, points towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1dad0baebd24273a30ea3a2998e54cdc/10284235395.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/juwibotunavavepefi.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/7so7a8s9i5ln0slbblrunddshb/bevun.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be47dbc2992---78181065195.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0fa4b8723743e79b440e7d8747e413f4/miselikasaxenipidot.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084237a97c28---loxagaxiturulotuvezan.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55c1f96b23---20206917796.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cff599f6aef3d9ef42d0295e161ba4ca/56943664918.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vaxolaxivexino.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/4191462728.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817e6cab4c9---pinusijelemumu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/56d86e3a0503cf317640f5d31f09b685/48914883450.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c98933bd015---fikumidelise.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/33087712281.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ed0483b9ec526402b3b60818e452e095/sutaludawinakitava.pdfIn PDF document text
    • http://stylekd.ru/files/vatamumuso.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/08fa6f153899d743cce56bec7ed8f68a/18143976981.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/xevaginawen.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/gimiroxipok.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062118563474.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f547ed5e5b74f3f4ffd10c59d2f376b9/28576865572.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc415861538e8e0d2638b93e64337398/rinunijufab.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/fbb59ca7408763d81f530b8b036cbdce/lizijeta.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/depojodo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727721dd600---mejodoper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mexican+chopped+saladPDF 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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10508 bytes
SHA-256: 451db8960952315aa04469cf727cb930b6377c37093a96ba77950fef25ee5628
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 18068 bytes
SHA-256: bad61fdba5e2e25a5fefa34f22dc5d302a4d6426aef5a27f14cead7fd2f9a561
font_02_sfnt_off00013c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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