Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8bcb572c1cb4ae…

MALICIOUS

PDF

96.7 KB Created: 2021-08-13 00:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5907d692ef65851f350f03d270b29e62 SHA-1: 6ec80b39db930cd9bf5f48be4c3b2d6af34d9884 SHA-256: 4e8bcb572c1cb4aec4dde39504d1d981061a384c15a29e67dde73e6a6a145424
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and heuristic firings indicate it is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vydavatelstvoklett.sk/userfiles/file/1015688208.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075995f6a2f2---dumusaxelanujesufuxa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c495b518d05---46693633499.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/85318706667.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/55000717131.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/50282701982.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/323c835d8aad0371f834d7a7b47be82e/26945145881.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160793295aef5e---78372199453.pdfIn PDF document text
    • http://laduses.nl/image/file/mogofevugebamegosuvudoli.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/29294982629.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/veleteka.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/61536645360.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/705713547.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/80343446585.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/88445964613.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04da48686e---jalakodazufigerof.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16102d93edfd44---11586762297.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ura9ml2njainah0h6cqnd5k014/27740874192.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/wuzamevotanukuk.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/76557651031.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/feluvupesewu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f939973a9---75096611703.pdfIn PDF document text
    • https://banghenails.com/upload/file/kagekesavebaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+u+know+what+size+condom+you+needPDF 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_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 17536 bytes
SHA-256: 3b81173587c1a43e1d01bc6238ac5542684860c9e753d361ea69d84698d1daf0
font_01_sfnt_off000142f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F3 10932 bytes
SHA-256: 1220d4aff63160a70bc97ffd16a5b56e8a24e46567c87eab419fbe002c854e77
font_02_sfnt_off00015c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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