Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c2d4703ec7896f…

MALICIOUS

PDF

103.3 KB Created: 2021-09-08 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06928bce405948023734333a8305a923 SHA-1: c4548c63e631846bfbb2202535e504cbdb7cf22e SHA-256: d5c2d4703ec7896fdd1ed69b005e0231bee4bf8be8386bbeb677cd1e1a844bea
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to host or redirect to further malicious content. The presence of invoice or payment lure language, combined with visual download buttons, suggests a social engineering tactic to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf8aed1cd---89676393112.pdf In PDF document text
    • http://0930actress.com/files/files/39093786856.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gb07628kct3j7lokggrbnj4k00/34360954450.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f78f021b---vobarogibif.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61899328776.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5a82c176---42733719072.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff516d2fe0---zixogujanomusikisodeforor.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/takiwo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617020122_rw4l6f.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04e5995023---daxizepivokuk.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/39579431896.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111f79244f70---15019108166.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/budef.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/wakuredewifolalokoxuze.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095519f12197---13369346513.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/04e80913ec13e3c346d4306028ee9918/xipubijodetorikefoguginam.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/fexarezibebubeso.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lukojuzudipuboxo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3kjr62rl7vqsm7vkgpihrravca/87483147125.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b5212d56---97454033879.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160877dbd43dae---filijit.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/fobogomazedofuvikuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=today+current+affairs+in+kannada+pdfPDF 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_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 19936 bytes
SHA-256: 439065a9900c548e2abea553b33fef1787d8af5aa14ee70f8fbe2b1d79d102b6
font_01_sfnt_off00015ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D5 10836 bytes
SHA-256: 38a4f5c9c39c1f3f92ef6ad727ec0f9265c376058f88df5a8aa1809c3c440322

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