Malicious PDF — malware analysis report

Static analysis result for SHA-256 efae68e4f96bd077…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 23:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fe6732d0f3b67a0323cf47a4162015a SHA-1: 19ffe2e351630f291c5b9106b2a044e0f0fc09b6 SHA-256: efae68e4f96bd077b17e47e9ab96d46f6ba1dc542edf7638da4e50c47bfaaff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The presence of multiple external links and the nature of the hosting suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://audreyheselmans.com/_files/file/32129874898.pdf In PDF document text
    • https://areicon.com/images/file/sodumuxijijipozupepoz.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/73482631200.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/68182928870.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210921010704-kapuxofiroguninij.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e8024aadf58765d1410397717426db8d/sodaderekipusuziragif.pdfIn PDF document text
    • http://sakra.sk/storage/file/1508510130.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6d386691---12153610280.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/27766597960.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/skiq2fbjn4r7hhe9gm5gsb3m00/genilozokoruvaz.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/69198609249.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614132838e577---42686337974.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/70748494627.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/diwamaxaf.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/maxuwa.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/83224721898.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/26671765579.pdfIn PDF document text
    • http://isvpro.com/custom/files/koxumosipowoditima.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac980a3fe6---kadinesofijezowuxegal.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/lujuromisos.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/12274222232.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614104cc1d621---75871111710.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rewejifazajatem.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13278964861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+free+word+processor+for+androidPDF 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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17172 bytes
SHA-256: 31f956b00fc993932cf040c435d4461f25204fa9cd823d427f231e57e0033eb3
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 10708 bytes
SHA-256: b5c3731c995bd1dc1e111d3a4c8ac92353762fea1507e03c71b61bcc529cb281

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