Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9a23dd897643e9…

MALICIOUS

PDF

177.7 KB Created: 2021-06-11 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8abaf292916b0fd94e283686f80e2bb SHA-1: 2876f4cc9c82dcfe3ab03fba2d0f1d4b29c86ed0 SHA-256: bd9a23dd897643e959214226a8aea6ad0f6bcc621ced918a590cca36b2bbc32f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=ubuntu+find+external+hard+drive
    • http://thegioidahoacuong.com/uploads/image/files/51260853581.pdf
    • https://tecnibat.net/uploads/archivos/sowemivado.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/19491651393.pdf
    • https://go2germany.ru/files/file/rovodazamuxozife.pdf
    • http://fullx.net/files/12655588685.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e9e72996---49857314680.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbca53d25a---9015191078.pdf
    • https://amatnieks.com/pictures/image/27605282926.pdf
    • https://airflow-skateboards.com/upload/file/xemasisimerumogedanakew.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a85b14e7445ebe29bafc6c82eccb72fc/foguworikuja.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c33235cca61---78414774456.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c3c2c2c98ceda08e343301143c66b88b/94871678769.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl0cjvajabksvnkecpfs9d4fu6/16608495321.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e7c1b98eeed90baece748ce49d22af73/70537059356.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4qtd83b46304kcriks9umvbos0/42020433019.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b116b83f03---misipofaretumotapitej.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be282773f39---dorivagevuvavuro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027e75.bin
8baa0e882c3f271d0d04c1835e85d0bf5e58ee446eff4d1490c2d1c0f0b1eeb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27E75 5076 bytes
font_01_sfnt_off00028fbc.bin
62f5b087774a1fde26c7e7e548c2f884612a3a3c2ad02c79166258016158b2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28FBC 12304 bytes

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