Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea008c6c6bf9df36…

MALICIOUS

PDF

177.3 KB Created: 2021-06-18 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 945950e88e973bce9a4b82e4204f85c8 SHA-1: 8f1879573f45a68eff54e2f3276a5cffac1a5035 SHA-256: ea008c6c6bf9df36a7e70d9be334167e1ff51787f84cdc7705a246130607851e
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings point to a phishing or downloader 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=november+rain+outro+tab PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3fe7c647---zekuzufakesiwuvebirirope.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/desinisimizolenezelorez.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/040c581d16746063fd679f89c16542ff/jedaxex.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/08bc17a8f1c65b62d38863b41b6da4b3/50472016858.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/c3rgssp5om44k1q362bcuobjoi/pesasabo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ba0779e4---95216008120.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/55c0n15c4332ko4eev3lcq143q/71284304093.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/47260277833.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9e1fafb93---78727796961.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c8447c78---85160322336.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/vusogudolixamagikizu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090008024c66---ratazekosuwuv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fd9e1998031ac6132f05d143d840e572/73353359957.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/24415934684.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/1585067821.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e0a5072b0f05e23caae197e8436198c1/95842302902.pdfIn PDF document text
    • https://coluer.ir/documents/file/boruluwejojesanemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000280e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280E5 4788 bytes
SHA-256: 2de65b267021475028647fa02846e95eed2db7bb069af5b2390c8d47856f5a7a
font_01_sfnt_off0002911c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2911C 11616 bytes
SHA-256: 2705064c57a2e324b8c39bd34c680887880b817cead157cfaa28946895b6ff49

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