Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66c98031741fda4…

MALICIOUS

PDF

187.4 KB Created: 2021-06-28 13:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1fe5819c66e6cc84572140e18c74c5ed SHA-1: 8034a1d6f49b77c8133ee944eebdbdf539a243cc SHA-256: b66c98031741fda4c2aba891400121d1db38c569524c0b181335739a8a5df4ca
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a tactic to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c63f9a60e---bolupesojodutufasejugovuw.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59e3ebdd---49711146979.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/01eefa754c27befe526d41e7745ae780/wawipuniwiwipotekibubazap.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/70274963dd06a83ab891569bba3c1dfa/sefiwapamomurujuzuriwusis.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3af4832b90d4b1f2718addd83687427e/sawelumev.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f58c14f5e1fcfae055a2425100b2fc76/rulorunofax.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e3189767a3c07e283c6cc9824cd97e9d/xinomonadowurajokip.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f1d692260ca77bd2f899f7e03e425eb2/1423020897.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b783580d8---75650978215.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086d381baa4a---90616950684.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/bumolam.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/nlr0mk4uu7fu012pqosfh27ob6/nowivobisazononedazomup.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e94116516---53857135474.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/99498567634.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9946098e---zojadulebusobi.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021626543298104.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcb027a72---48684573238.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8f2d47a1---vekavevimadulurodizi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6945f6d088c24ace3db60429ff33212/zebivazukanipojafowa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705d53a2e0e---bojubinoxif.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/03616fe8fc2f913be12e928f7783e355/repewasufiwudufajer.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eee8705f7---danijuvugosepaka.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/68549092007.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/femipadiva.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88e71568d7e347293778370e4992f00d/67567214497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=principles+of+corporate+finance+11th+edition+solutions+manual+pdfPDF 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_off00027af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AF0 18844 bytes
SHA-256: 6e8e3e1e1086d8594726854e16e64f2b2c27e96065c997295fa0a56e0f241de0
font_01_sfnt_off0002ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C56B 11040 bytes
SHA-256: 63a334ee9f7a97ed5f086657535ef519623897f94be2d112f2405fa30006dfc9

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