Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdf7b0ee4445693…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cc2698fb372e103a45600d15180a5ac SHA-1: 7cd90d2a2b404fae7b323f2a783cb44d2e310b35 SHA-256: 6cdf7b0ee4445693259a25de4027e13cd58ef29b69324b3224dcf5b04a0c2638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=plurals+in+spanish+worksheet+answers PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/n43423q93dekfccromiu2csoir/lamugelilogibisufowibiv.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202178101274404.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/komofobew.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/sibupuweneluz.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/72487701290.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/os06u0drmi522vj8t7bihsis66/kepubimibipele.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866f63d2ec5---10479643943.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/4423842416.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/248bd8ea2d28d342cef2336021b0ca9a/raredon.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd94bae2b5---44159973691.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d039dd7fc---26336604774.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/xipetebiwaluxile.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/vutuzesotobuze.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jobiv.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/wedetotevesu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18e193e3b---zatez.pdfIn PDF document text
    • http://ha-sine.com/d/files/lufexo.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/nuwokamep.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/57247448957.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/70097308551.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/87290391717.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626122164.pdfIn 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://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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16576 bytes
SHA-256: 5d5526ea8bb89d936edf2688baef4cb2a3968880e5efe15b56dafcd37fae46dd
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10628 bytes
SHA-256: de8449cc64657cf0787d61dda8f1dbca04c113be08755590afb90e5fb13c5997

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