Malicious PDF — malware analysis report

Static analysis result for SHA-256 f231fcf96573ea96…

MALICIOUS

PDF

97.3 KB Created: 2021-09-04 03:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10c0334017406a1dfd6c694f81a36102 SHA-1: b7cb39eb02180d3cdaf089cd896cb3062e79221e SHA-256: f231fcf96573ea96db1732cd3735b717f91c7a4e57b4625580785a3680a11070
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9jvhiaj8f3i74ftsfbnlh9rjjd/rowowe.pdf In PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/fonokatovijuniravupofex.pdfIn PDF document text
    • https://media-get.com/userfiles/files/81610133862.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/wadejuvuromafumowakusew.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/53074877515.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21d0be33b---saxibevunefedit.pdfIn PDF document text
    • http://mobilenmr.com/files/files/wijufugaletisugod.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db26eae3b---salenopekeloturimaxepan.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/61593756595.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210825125321.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/zawozapado.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/bidiwoterakotol.pdfIn PDF document text
    • http://innotack.com/userfiles/files/58209067208.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073468dc5d61---43006742650.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/dejenaxet.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/74495116025.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/virogak.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609103d72b93f---kolegidutesupomemekuvogol.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0300b1fcc62241da26c9b9d9408a23c/raneweze.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/78528012546.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210829_37340704AA399DFC.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/vepuriwamez.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zokujemelazagivoxelujepiv.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729cb340a08---pazemokipuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=human+rights+in+tamil+language+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_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 18660 bytes
SHA-256: edd88cf870169dbe3e8726d518557845522001cb2b339dbae459b94e6cbe8feb
font_02_sfnt_off00015e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3C 10916 bytes
SHA-256: ef549086efba4aa40d0d8b294be81216618a502928997f947dfcbba6d3afa1ad

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