Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d35db529d03065…

MALICIOUS

PDF

92.4 KB Created: 2021-08-12 07:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ce2c921280e0fe79616822c5a2513ec SHA-1: 2f997e93d98082aaaf78f71ab346f7c00e82ac27 SHA-256: c5d35db529d03065be071cef2a0c4318cca0b1ec07271da4c733d533ffd555b1
180 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of embedded JavaScript and numerous links to potentially compromised WordPress sites suggests it is designed to deliver a second-stage payload. The document's structure and heuristics indicate a lure related to payments or invoices, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 9

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/69ee4fe43eb37b5c50a65c4e75047c06/91338656916.pdf In PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jonipemurudakevufopipaz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0b060d6---muzuvopilanaxu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ec81529a4d9604234ac9dba2524eec5/jolexuboxonan.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/27e0e329042319840e35f99b1296a732/47726381666.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/furatunugorotanil.pdfIn PDF document text
    • https://krossi.ru/images/content/files/52579356902.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/61011085607.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/bukebobumenimu.pdfIn PDF document text
    • http://klefmarken.se/upload/file/99445114861.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80203366250.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160704c6785c5e---vizalaboselujo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd9238f32---53293942962.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/namakuworewunuxufexekiri.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a071803eef---pudenasorav.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a420c5ed6f1---23590371374.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076032ea0202---93805400637.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/98395714356.pdfIn PDF document text
    • http://altinay-law.com/images/file/ralumiwisupapemefa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/57724820145.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b44b4c6d8846808cfe03c5620b5a3dfd/gozufizesunujovatob.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/45235115698.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cqrgimk7f0onkg2qhb7dq66n53/zopodi.pdfIn PDF document text
    • http://partnercable.hu/files/96549837721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=payment+coupon+book+template+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 17488 bytes
SHA-256: ee4bf228ad2ed5bc19ccd0bbc75d7f46fc93c6f7e9bf11a59bfd02a9b0d24008
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 10724 bytes
SHA-256: 9b91760bb1eb00139d4000af52e09933d447618c67c5e293a04e8b81d1b6f846
font_02_sfnt_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE4 16192 bytes
SHA-256: e2ad764752cd4be5999c18614362e0cea8e9c563e7196d76fd0086f860ccaf5d

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