Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15792c2a610fc5…

MALICIOUS

PDF

71.3 KB Created: 2021-05-25 17:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 78f9ba1290ee50c655e693bbc12b527d SHA-1: 52e6675d8d2879fb2d5180a5ce01d7210d155990 SHA-256: 3f15792c2a610fc5204bc2051ba22db8dea796d48fde70a1697fd9d760f2d795
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely serve as lures to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pjfqcef5rkrpkc1r5ggrlkrcvt/kafavenen.pdf In PDF document text
    • http://zzliuxue.com/upfile/file/%5C/46199774304.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/36981253801.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c19d800ad9c45a03c6e4d297da34b49/vemexomuwakezaselexe.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/45500016709.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04442ad156---muwukago.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0206a11af43e25ea45c3312d896ce157/woteladometil.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/80454465212.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086068dc7ea5---10228293383.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/firewebub.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/62507597fe31e66229688a839e46ec4f/jifofugelopafi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ec9b14b6---lipumovixatafujito.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7afbd152---juzedodotazixixu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210510120558.pdfIn PDF document text
    • https://wastran.ru/uplcv?utm_term=%25D0%25BF%25D1%2580%25D0%25BE%25D0%25B2%25D0%25B5%25D1%2580%25D0%25BE%25D1%2587%25D0%25BD%25D1%258B%25D0%25B5+%25D1%2580%25D0%25B0%25D0%25B1%25D0%25BE%25D1%2582%25D1%258B+%25D0%25BF%25D0%25BE+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%25D1%2583+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D1%2583+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BC%25D0%25B0%25D0%25BA%25D0%25B0%25D1%2580%25D0%25BE%25D0%25B2%25D0%25B0+%25D0%25BE%25D1%2582%25D0%25B2%25D0%25B5%25D1%2582%25D1%258BIn PDF document text
    • https://wastran.ru/uplcv?utm_term=%25D0%25BF%25D1%2580%25D0%25BE%25D0%25B2%25D0%25B5%25D1%2580%25D0%25BE%25D1%2587%25D0%25BD%25D1%258B%25D0%25B5+%25D1%2580%25D0%25B0%25D0%25B1%25D0%25BE%25D1%2582%25D1%258B+%25D0%25BF%25D0%25BE+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%25D1%2583+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D1%2583+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BC%25D0%25B0%25D0%25BA%25D0%25B0%25D1%2580%25D0%25BE%25D0%25B2%25D0%25B0+%25D0%2PDF link annotation
    • 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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 6196 bytes
SHA-256: 67faa5777f9aebaaa14adda17269f2126fcac3d7014b931cd3c6bd9b43b8d2da
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 13968 bytes
SHA-256: 1b250de63e8b3de36403240ce17cc004abb458aca8307dab55b7d4f5cd232c09

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