Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c88eba14ba0c315…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 03:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7330fd5dedd8efc19133c391cf2ad43 SHA-1: cda91dd8ea431c8dbaeb9bb1b0314d156b156158 SHA-256: 2c88eba14ba0c31561e003b1e18ccff44a2d9282a89a36c6f3d06c9251638c55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=company+introduction+ppt+sample
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2045a564c6f55f743b7a48e432aa2db1/retaxeketitefi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe57826265---57206953875.pdf
    • http://bulk-supplies.com/userfiles/file/xokimolawarozudibija.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/nhmeifvtrh8jrcrn6u3bh8bucc/54857642921.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobujumon.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ae6e82cc---37050425162.pdf
    • http://mobilesamara.com/img/files/file/pesotomojafukigumubi.pdf
    • https://securityguardsupply.org/php/uploads/file/rexafosasuvozod.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/5d217b05129da4558035fa596ea20621/noxozasuxigulo.pdf
    • http://beijinghuojia.cn/userfiles/file/97223878599.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989818417b6---rewenalubis.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da489bb3e---kuvagewobofetumapirur.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2270ad07---tudefezages.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/91254136625.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/au1pqrs9341ovdq68feanovl42/8186593896.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075381671fd7---kawuseworexejaminakizijit.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7004a813ae---bemikabet.pdf
    • https://immobilgold.com/file/25044463373.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7186f9c59d4c1051a057ac185e8afb35/xesavak.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d338141e3---lurix.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adee2a3e95---foxezedilami.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709bdb65b8a---18401841287.pdf
    • http://asianmosaicnyc.com/userfiles/file/gekibogutazukux.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/fibikedomonitokilawogeder.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f636661ebd---xesejolapamoximukubibune.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a69c621d971---9650087825.pdf
    • http://jncs.kr/page_data/file/20210608091226.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f518.bin
30d1426b960a1986bd1756314f93b2d63586ee46aebebe5dd4022fffe8543c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 17388 bytes
font_01_sfnt_off000121cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
font_02_sfnt_off000139e6.bin
b59df5f6db2596f3b9fcb5cafa376d04f7c811ad394b1213bf672b3a7b49b577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 10920 bytes

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