Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fd275b1d607d8e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 22:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db1dfe5b2d3702154a9c1130f1a216ef SHA-1: aa401ce5f83308336668aa52b07c1e661a5197b3 SHA-256: c5fd275b1d607d8e66d04e544d608f79a84959610dcfaa017b49c57a51391d69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially serving as a secondary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://5mal4.de/moneyvidya/web/images/userfiles/file/dosorube.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c1614cca---46391906070.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e74562f569fe371c0584a4e5493c6603/49600381847.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/ketatobawiluz.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/94025305392.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3ab9811b2ea103f8fcbfd976f17a4126/85211608208.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/44104047839.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b5f3b64c---12089319797.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0df5278c26d392aefef784c98e56d77c/lojetisurikalupekomajami.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/xagamofejado.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/rodulujap.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/52959566395.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4c074dfea2b786f6093ec0fd6d4448e2/49306343195.pdfIn PDF document text
    • http://terminsk.by/pics/files/jemimuzutanobodev.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ed72ae63e47069846a5c609aacb4a551/61309238053.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f96b2493bd---puviduguv.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/22608570545.pdfIn PDF document text
    • http://poiskvod.ru/images/file/18164871135.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16129028a54701---84644733202.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/duzugijoligufuwuxipegera.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/t2f4jq92a0a5sgc48b7ibktpgb/80977938761.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/ramozananekabasu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/sinotusevipim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=to+use+an+outline+for+writing+a+formal+business+documentPDF 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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 11108 bytes
SHA-256: 427d064ba14f4d6df28d131dddb088022a195a13002b31cf006c122364f582f3
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 16664 bytes
SHA-256: c13f53a5005516cf8b5c4e6d3262c5d1ed151ab2dd9fe6e9787a29bc7cb988d1

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