Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc4e873c992832b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-10 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 31059d081d7b4e59a8ad9fc27eed0016 SHA-1: f8716680654fc7649cf6f62037a9424ab7192490 SHA-256: fcc4e873c992832bfea0b076fb4c0555c1db2ed7beeaf73a699c984a8f08b2f1
180 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://amdind.com/userfiles/file/pumuzataxexeralalakiru.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf36c7d4b0a---96558383240.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/jifididabegavusivis.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2151fa00a1---47194174448.pdfIn PDF document text
    • http://land89.com/ckupload/files/fojalufaziriz.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/12635872143.pdfIn PDF document text
    • https://btegypt.comfile/tutoderalujejanakazido.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/74282349501.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b7f83b0eace49c57b2d35c8a87e241e7/fomalawafivotemakabodegaz.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/rogijewozuz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/88515647e8948e304175732ae98d488c/11237152891.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/vidiwataporumopigekasa.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vunosib.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/jivurufi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc022b30c---jakubejizu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vewavudakanupidotenebe.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/filibiwozezirodexuxejaso.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/59587650232.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c1280bbc868fefa3428ffdc09372ca9f/63327467637.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/23657163167.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210611050508.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/67570706838.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jomumidaxumuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ingenico+ict220+resetPDF link annotation
    • http://irodori.kir.jp/files/file/1781014777.pdfIn PDF document text
    • 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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16556 bytes
SHA-256: 6e5614997d1bb0e4529e7eff47cb4684ed3428664f0e2c24c305cd1ad8b3d2c4
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10392 bytes
SHA-256: fd03edcaa9aa015722069c4daa6211e1ae30d23689fbc085a5b02665982f48ef
font_02_sfnt_off00013dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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