Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5ebadcb8bc6fba…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 07:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c63dea5d3cc5c5a3b5731a3e063f042d SHA-1: ae2b76725861b659795b80e2a4b4b683e586f233 SHA-256: bc5ebadcb8bc6fbaf1dfc81e718f370d171766b92dec3d70fee9aa30f8cc00ba
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for distributing malware or stealing credentials. The embedded URLs and link farms suggest it is designed to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://inwebjor.ru/uplcv?utm_term=cognitive+neuroscience+the+biology+of+the+mind+%28fifth+edition%29+pdf PDF link annotation
    • https://desense.eu/uploads/wysiwyg/files/naxoj.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/bipixagutugimedeb.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tezuzalofidisekalotuniluz.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/pudun.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/15603981303.pdfIn PDF document text
    • http://immopolignano.lu/images/13116024190.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/texizenuk.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/20967363245.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/501b95cf7d5fdc12c732192ceb1e5a64/kipumidirisubozafi.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/pefumin.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d049c17cccfd134003eb4fa6e4f0ad5/40439659721.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/37e5ebf809821a49b3036d87f67fd521/41903791432.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/81565735781.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/93468246053.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609226291288e---99720885767.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/zokakomaxelumadumesekox.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d96f9da1935---wisutakoju.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/t5nijoe2djclsaiv0m19pv18bf/nuzasofabakatew.pdfIn PDF document text
    • http://evola.it/userfiles/files/vexeripivatesavutezamel.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/5793066489.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/63883822437.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fe153bb67---jukabizetotajemadusipajod.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/292984b2e8108e6cef6abe1a332cd24d/gizabase.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/78590087231.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2paqrtu27mtslq0hlbm5t6cf73/tivaxolumewimujozuvudaruw.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/gemumevetegotagobanaletug.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b8aa84018a331016d405318bc3ef8205/gepivubovaxugupolena.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 17844 bytes
SHA-256: 62f43a2a0273ad5f1fb9b7f25e2dc073bae3dfb631b1d59f812e34c412ec9d60
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 11512 bytes
SHA-256: 6c00b1eb4e6be0caa5da6f9c52dda34b03eb5f4781df88d052b2ca9d163d6379

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