Malicious PDF — malware analysis report

Static analysis result for SHA-256 8215062633f8af69…

MALICIOUS

PDF

89.6 KB Created: 2021-07-15 15:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48c86bdb172398f6fc2d42689480122e SHA-1: f36b8dd417ec69c247183ca094031066d84bcd4c SHA-256: 8215062633f8af698cb1fe4f61c435d32b57c9fee69522fafa7a50c58f9877a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4373c809e2---rezozobufizubaziderirubux.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b0843df0df3163eeea468b04d7b0515c/60011375711.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/tazigitixis.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d360c93---towivubetosivoxalosupeje.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/notomazep.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9541e710f---tewunosazesomamixigimafaf.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/579868022.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf4ee4124---5189813821.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106281403324354.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/76569596030.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r6rgp2q233khi12rvhmm223qo0/12820172456.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b870d137679---72523606711.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/95151498861.pdfIn PDF document text
    • https://aedwea.com/upload/foto/72613327991.pdfIn PDF document text
    • http://toonesk.com/upload/9236514159.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/95b07aa82892c2c7b912b4f2bb6e8e06/duvitesepibadetowoxusom.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ub5ok9lhvsdr9or7a0nos82v0o/8827201525.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b8001679---82281029255.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f72be9a57---57461083816.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/14996346481.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96898297036.pdfIn PDF document text
    • http://runo34.ru/attachments/file/35136651022.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tobazoxuladawusugape.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/8436983336.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4a4bf27a---90582737207.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8053ff1a---mepil.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/gixaxokazelujok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=quality+control+in+microbiology+laboratory+pdfPDF 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_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 17120 bytes
SHA-256: f434d7b28678ca277d87103e2dfe0a95f806fde6a75f2288799a66c0388c3a73
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 11076 bytes
SHA-256: b99df8ebc96ad749e20ffe6b91e1fff7987e0611d48074f5aacfc2c8c2e935bf