Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a4701a63acb77f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 07:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f658b0cb996f1874c44338f7a46a268 SHA-1: c2eda25d0347b3f6a32c0d83d0a23b7fc82e14ac SHA-256: f6a4701a63acb77f6b4d1d52a64937ae902820ea63e4f35e86b00292972740b3
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution infrastructure. While no scripts were directly extracted, the nature of the lure and the embedded URLs imply a payload delivery mechanism, likely involving JavaScript for exploitation or further download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://huntic.ru/uplcv?utm_term=android+image+kitchen PDF link annotation
    • http://suriyedostlukdernegi.org/image/files/kunerunakak.pdfIn PDF document text
    • http://methese.com/upload/files/80303846295.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/57272810540.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109062105009477.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xusibokigakube.pdfIn PDF document text
    • http://th-hl.com///upload/files/18035653603.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fde25c9c---90889090239.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/53101507792.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/rijaxedigudekonisibigi.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20480254652.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/54620367979.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/pozebijexexezogix.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c5b80df6f0954eb5fab6baacd956e928/bosuvasuragubizalena.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/genoramuro.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/bikosutuj.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/fozujo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcc340073---18604417652.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/28652007056.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/54503747060.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/79987357266.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/kesifonebifipuwekuz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb3e248ad---liranedafasenipipo.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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 10676 bytes
SHA-256: bb0e7862f2d7fa159c67cc191c75b9b481f63a4f76b38065aee92b77e92fdabc
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 18268 bytes
SHA-256: 3dc7859571f30d0924224db0070689da235f1b93b2e206f47436b82033be9bc8

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