Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a8b8d58888699c…

MALICIOUS

PDF

98.2 KB Created: 2021-07-26 02:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8e3027a5a8bba1a22570af6d26983c9 SHA-1: fcdaf85ba8452fdf8535935e96a6866201da9e21 SHA-256: c8a8b8d58888699c8676f7c5cddfac58b9596277a23b1ce796e7b6a9675605c0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute malicious payloads. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially malicious files. The presence of a visual download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/309168a27b3f68f945bee33916e681b6/96509080153.pdf In PDF document text
    • http://lookkorea.net/userfiles/file/93083794797.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/musanejanore.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bebbdcb14370e81456213964f3c61eea/zafukepaxevifixivuzope.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/bokodozezil.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90f6cb97b---nulevivapijagirozuguw.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/86a4a7bfc50028a76df38e47bf5b2f98/5520353368.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1741727c84e130b108e7f2957ecd5799/5565154516.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f4a005096461203fcde27aa93c74ad1e/46722086075.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18430175098.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/63979556978.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b8b7e92d06f083dedae1ebf61e1a7b38/79640522689.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/86068818855.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3babbbea6f4b0fc8ee71b7aaf8d839eb/fodiporenegidupanaxitopev.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34275779b---88205288873.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6c66684d627d8867ea973ef49feeba96/zifupepebotigapaga.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/57593670518.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894d9cebcba---83353733546.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63694baf6---12667755583.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5cf973ce---nujuziluwiwalowubefi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/afd8a772d1d15ea85f76bef784914f91/jobiguwosesexezeku.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/guner.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/rudonatonotelumagevamiw.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/v2h0nrn2r1c75il3lnitooaqd7/wararivareb.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792153141a0---27939671579.pdfIn PDF document text
    • http://crm333.com/documentos/file/gadaxatufigixetaser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=debut+video+capture+crack+macPDF 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_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 17236 bytes
SHA-256: 2f3fcbefbb3f0199f51265daade14b2725ec34a21758d4da76dab7b2bfaf7dda
font_02_sfnt_off0001615b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615B 10756 bytes
SHA-256: cbc302387d5ec17e5cc72ce43ce1a8412220b35c36edcab87bca8783453b36ed

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