Malicious PDF — malware analysis report

Static analysis result for SHA-256 7214a1b1e8c2e08d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 12:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f0c270660c3e7e84647e9a5aaabd3e9 SHA-1: 38ca4f178a4a851823f548a5e836180ff04d9782 SHA-256: 7214a1b1e8c2e08dfd97b24735fcd660b8ff6297078d0d5ec92aa609e425f17a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content or to phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c60048cd8f---8472751944.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/wupovu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/tubatezuwo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b23eabc94d---42717459152.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9643d250192ddc0eeed1a76196a3aa39/13689242444.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35547134281.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076155e24c3b---63943841196.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/zafatigebesajiwadimeko.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/bamuremazit.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/kujitogaralofosuzo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77bbed07e---pixevopoxezodefede.pdfIn PDF document text
    • http://wamer.org/userfiles/file/43399937970.pdfIn PDF document text
    • http://abroadster.com/files/81301126771.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sogelujimujalulo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd40576f1---leseluf.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f79564e75083113da94e089e1aa783f9/pipadisovuxova.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/gifonexugiwejaveno.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/vugovujila.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4cb7b109---40280120572.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a401f765034---musuzugedenakipisuf.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/zedosulisive.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/082205078571.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/705faa50c3810605fb864f08aaf550ff/50995521205.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ced62444153---81544211449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=uipath+studio+user+manualPDF 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 20460 bytes
SHA-256: 3b4cc906ed9a290bc8b93d7bed49cb2734741c0ff28f1cc634a9b651fda9564c
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10764 bytes
SHA-256: fdaa04661a185c19074cbb836ca68b8d3d0756db0ab0e58ce866088a7b78bce4
font_02_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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