Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e4be1ceb2c33b7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 11:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 558dd6f1f071eff826ccc9a7284aa74e SHA-1: fe9fefeb6730df4700c15569acb792a73c3ae5a1 SHA-256: 94e4be1ceb2c33b7c744bcbf010ba7a01d6a3cb567feac0827694a4d8ddf176e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nachhilfeschule.havonix.com/ckfinder/userfiles/files/28131872076.pdf In PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gojipirizedovolaz.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/76297106057.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315fb5276d8---71783839541.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/38736310546.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zewalerametexubavovulosax.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/wotaxotejowuvig.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/lusitidagukisamux.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/76713453539.pdfIn PDF document text
    • https://ebooksweb.net/files/file/tumexoninifep.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/tutemofudomosabitofi.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907160223553390yeu7xx.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/544dcf7689d45c72aba2d6cd17559e37/14867661170.pdfIn PDF document text
    • http://master-vin.ru/files/file/pijiziles.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/67108097394.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/99750113513.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1c76c1d0---refanifasojititafugis.pdfIn PDF document text
    • http://gaudi.tw/upload/file/nagonezuxevixojeg.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/78735213114.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/jilum.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/56437957625.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b9602120---2568031187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apk+perfect+world+vngPDF 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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 10596 bytes
SHA-256: 66fd2e15ab2d58576b417ef36c5dd5bba2b017dfda69be19d082822f730e99f2
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 22312 bytes
SHA-256: 7c9af164601a8d725e46250adb63fe70a51320700e74b06e7ebcb78d04b72624
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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