Malicious PDF — malware analysis report

Static analysis result for SHA-256 d674684d1e7914ef…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 15:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcb19eb4c7c5588ffcb86e470c61d0c6 SHA-1: fac583d988f8c26858d54672279f12d5f1e126c2 SHA-256: d674684d1e7914ef41f6b8ef4698bd6512710759bec79da10b52df8a01a35000
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to trick users into downloading malicious content. The 'Password-protected archive lure' heuristic indicates the document likely instructs the user to obtain a password for a separate archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://clinicaveterinariamontecchia.com/userfiles/files/xofabetagabivosuved.pdf In PDF document text
    • http://roseeskin.com/userfiles/file/20210906130059.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/xuditesadip.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_092531.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/99253236317.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97614564977.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/83858889443.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/firaxuvusujijegiwirugaxuj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b779b115e---97599966749.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/16323825118.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_231333_619.pdfIn PDF document text
    • http://epplast.com/files/file/vudesagosazoxuzuzen.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d76e6960e---91514214163.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7652aa2d---88234662493.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/bevozakigewide.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/8071073711.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/ragasaz.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/piwavasaxobomasutimavar.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/kopojeviwiwofob.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7db6c3d71---dibewowibopebatibux.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/lijivedasaxasabujeji.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/22300054452.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/84572890004.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcc69ed57---4730425230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=just+cause+4+ppsspp+downloadPDF 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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 10572 bytes
SHA-256: 1bae831c5d171eecb4caf09ed3e1168ca434571e793e9e3168ac948abbb85620
font_02_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 18916 bytes
SHA-256: 018569ac6ab08e8d2319486d6dfce411e0a51fb528164704f3a5ddb923732f1f

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