Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc90b3a44c7e7aa…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 14:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a73c0e507459f3d150c230dda92d2849 SHA-1: ec6a299ca3cb98ee5e07f73c7a8d5d4b3948dec1 SHA-256: ecc90b3a44c7e7aad05009e2bb1fb074ee86e0078c8af4aafdee4c4769291517
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves leveraging these links to potentially deliver phishing content or further malware.

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 https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/72b054e3af97caaec2f024fc7eee1907/58099094256.pdf In PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/fidilipifugapewane.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/63248724206.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/78f756cff12100aabd99d4ace8161938/5935337186.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/64294325983.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7cd920cfa---rotelidiju.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/87753388063.pdfIn PDF document text
    • http://irths.com/upload_files/files/71122579256.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c26969aea---subazu.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/wizafabuwadogota.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce18d2f40---moket.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609347211dcb2---46283216409.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d8bdc3dabb5735bcaac7386b1688c40d/bukemuxolopukarozos.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/litegobegeborunoreli.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/biwozitabidisupos.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161164f4991eb3---ximuburuvanorajelixerop.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xeraxevevimepiwemiw.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/dikevaje.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef1912a8a---19943603104.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/45418389631.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/kesomutogulidiruxukudoxo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6abb676f2---1033367208.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/34193551887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minutos+de+sabedoria+%28simples%29+pdfPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/20686230264.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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 11048 bytes
SHA-256: 3bf55cea8b84cebf16dedc527d997ba653cd30dfb6166afda1de0591e1117551
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 20156 bytes
SHA-256: 16395e01ff81fbd97b70d81f3699a8369600123bac553b9edad690b92a84f993

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