Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0012f6da81e1eb8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 16:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59f8c65776241072d0c3f3c2570e1755 SHA-1: 3d1d9fb559c7664e1f29e42bc0f8ef17b91b6977 SHA-256: b0012f6da81e1eb899b7a76dbb68a708ecd10eb4eefc43e9500d3d30c54bab59
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. Multiple URLs hosted on compromised WordPress sites were extracted, likely serving as part of a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lqvro5fkf0if3kvdsg5bjngj37/sunekuwufitidaga.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3fed2b514d1142082bb09c0897c54462/90274480718.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a40nvr83gurhkc5eu56ddcrsdt/takaw.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/rejotawavagag.pdfIn PDF document text
    • http://kalikraft.com/images/file/90086113462.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1c4ae587ff68b33c206d9b68d727cc84/21359648190.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1521ef54598357c9cb8aa1f0b8f0453b/mogivug.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85375521451.pdfIn PDF document text
    • http://nature-revive.org/files/file/38891475265.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/73135243978.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0fb78315caff7884e2ba8a087e29762c/73638658480.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83c7e1fa7---debajar.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658e1efa0c---vuwoxaki.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/248561646.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebec640dc---59805310458.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571f3c11e---vabepixojuxitizukifimusu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/53811237312.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9425d56567---mitixabe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7591602314478438857f90f6218cfff1/72442882272.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/tixorutuwituvegifotu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9566kqi1b24qo59ckoudtoilp4/96034521032.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16239028117136.pdfIn PDF document text
    • http://pb-book.com/user_file/file/jigamoset.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/92f067865e40436bd986c076b888d2b5/dazofatekufixogedinefudel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+pampered+chef+manual+can+openerPDF 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 18284 bytes
SHA-256: 80bf350d510420e40fabc0ef56346d5aea5901dd85668817f80c3ac8b1b2e25a
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 10968 bytes
SHA-256: 5f99951102d582cd68c26e37b94925d5e1ca35c87818a1cc97b2d11b766e2333

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