Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3932049bbdba52…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 11:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85c94863837ff50be0d26d285a5b0d32 SHA-1: 7d44029092078270f64b9fbc1349743733c940bb SHA-256: eb3932049bbdba520e74456e1e2829d5f0206f0f65a0c12f26ab93f1cb8906ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards a phishing or malware delivery scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://triptoboloyfoundation.org/editorsfiles/files/34915246114.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d67be874a---lodekagupibik.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zoviv.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/27071626150.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/62220218588.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7360dfb9cde529eba62d7af46e658301/nuzokivokebojoxixed.pdfIn PDF document text
    • https://tavio.ru/files/file/pekebabogesujeviwu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f54d0a624ab---45906012974.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e2e18ad3---mujipazala.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kuromumo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/85436384637.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d21c61b3b60---94794087141.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7e49d9c7485b24858a38c405eba1892e/mijumuv.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/91890643097.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/887f4323de2dfe787cc72ec75dcb8ad6/78091476574.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/tiser.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/31rqp66sn8sbk41f8t8dhtmne9/55749185823.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/xuretaj.pdfIn PDF document text
    • https://arerp.kr/data/file///xajagetuvagekego.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/4f5355acb2a9508544c4e65429b57c5b/dulodomizovonisirif.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c06fad6d6352326558509d5ef21e69bd/mitegul.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7f06436a09d0bd96aa618935a1836cff/pexoto.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add50dc842---92146520121.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/domukuludiminosamirut.pdfIn PDF document text
    • https://chptravel.ir/data/file/17347840408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=social+security+disability+form+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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 18104 bytes
SHA-256: 6b7bbbc4b7370ab91c5972cb09620940649f39cf395547ec753b9b8ed61ce671
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 11104 bytes
SHA-256: 69a726c5061f7bd9f4e9a3bbdb63ef3756dfbde19055ea0f600f75d530fa9498

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