Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc093cafafcebf4d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb7933e3d0edbab7452faf32c50a2d5c SHA-1: cfcadbc3e72c3e8c7d6751b720499e8af5b9aab1 SHA-256: bc093cafafcebf4d28380ea1c1ff67ce51b473c23a8d56fc45fa616483e77b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://kurishupally.org/userfiles/file/34224219658.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jeruzarusinifamafosinex.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/26686017352.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/22535083084.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/bokoxiparadeguxotat.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc85103e4a---sedaxoxeremagapujenitu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/88661979597.pdfIn PDF document text
    • http://zl369.net/userfiles/file/sixavevidaviv.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/86271689237.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/bilixuji.pdfIn PDF document text
    • https://protrialse.eu/files/files/bunosuvelujadetoto.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/letisanujosekisururas.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/sosozuverotageraj.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/79218454267.pdfIn PDF document text
    • https://reha.bg/content/upload/file/32594850453.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/fojevinusolivaberaluvu.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/76792899724.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2f6c8edf---pejetamipe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832357289f---85025932454.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/xikirivuwesekireruvip.pdfIn PDF document text
    • http://staropolski.net/Upload/file/manazeparasoromosa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99cb89879---mitozejolusumemoxop.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36903909141.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/nozuboxatafovokumaxejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=attack+on+titan+website+gamePDF 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_off0000bd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD32 16536 bytes
SHA-256: 2b895685619289e6078e94ce31b85661f407b7a0f0055ddd33d809e5aeef4c9b
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10728 bytes
SHA-256: 549e45d5db6f825413b0cb0cc7754c924df5929019c53de47c930daec6e17ddd

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