Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9c9110f945897c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 07:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b34567ab713775f10385ca47f387bcc5 SHA-1: 9c5ba287c6704f5f169598661aa9391ea51389a1 SHA-256: 6e9c9110f945897c06d2b9b2e35446b7af563445793688482d7aed78c974fb3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21663707c2---71489922578.pdf In PDF document text
    • http://articolo17.it/siti//usr/foto/files/loviz.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ibd7qc3lor7g3363jp2vqp5q3t/besotofikedi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rabelap.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/455222a97040de11dcd0db08afc5ec2e/44709171776.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/siberubinokezajedanuz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ebd3f006846c594d33f41024e5df0006/9169272064.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/wiwafel.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5hmf8b54frunv5j7js1bi9gqfp/65392499904.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/gejuko.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/92406238024.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a664eaed6f4---sawudaranugexuroger.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zimizaxegitu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbed08a714e6d036a1f366093942f7d9/gozamefunowipuminav.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/15289438448.pdfIn PDF document text
    • http://3asoft.vn/img/files/tepamagebubat.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65d7bfc0b4dede965de512aeee0d4cb9/14168571665.pdfIn PDF document text
    • https://actorconseil.com/files/file/mulipoxotenemoral.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5971dedf76a5d57d04d54d679d72cd91/97427797061.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/tinugivutosipupuribefeni.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/mapufiwupabojuwubinizifis.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/67680384139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=grammy+performers+2019PDF 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_off0000ba21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 16508 bytes
SHA-256: f3ca24c6644e9d4a2b082a1bbdacac6a737ca102c15f38aadb262a4f137cd57d
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10796 bytes
SHA-256: 50e9537f96050bc43d6396b6357375e589e75626b450f43147b37f17ef4da43e

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