Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38e82ff5619ace…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 23:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 778da826f6a13c850867485e6ce7118c SHA-1: d68c536a44b48101f3a4d401df0b2303509deba1 SHA-256: 8f38e82ff5619ace6447f653f0733c9a7ac0940b7d1d7e2a6006f8dab4ec7126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded JavaScript likely serves to execute malicious actions or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://geneolock.com/ckfinder/userfiles/files/98755622226.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06ade3f9---63778594170.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/juvewoloxanozevo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/vinabodibamaxo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/lulurizumipimazuwutare.pdfIn PDF document text
    • https://birotex.rs/images/files/rusunakajaneku.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/nelupolakogilinevurar.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fcae325f2df8a68ecd00e148786a79c2/womisu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gixewedirujewuri.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vaxutuwuseripumimumuvonup.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/gejovepoziwojamosurez.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/38947585399.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/todamezufat.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/gikawiresowin.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/54985960180.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/mikujut.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/2381298894.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/10949100660.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/mikusik.pdfIn PDF document text
    • http://foxhill101.com/userimages/56067744061.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sedowivujerusazadelo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143d81716597---2042807127.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/nupaxorasujovaf.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130accb89468---kumutepira.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/momarer.pdfIn PDF document text
    • https://educhina.mn/editor/files/94907018155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+chronicles+of+thomas+covenant+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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 10912 bytes
SHA-256: 5ed0a51912ab6538108a917fc4ad0d90ff2d4b5036eeb6df01b72f926c109604
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16540 bytes
SHA-256: f9128447c38b8e6d711f1f323845f25c46af1a1b143843f8e144b44b1903d652

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