Malicious PDF — malware analysis report

Static analysis result for SHA-256 905aa99efb11b4c9…

MALICIOUS

PDF

92.2 KB Created: 2021-09-05 04:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf3c68a983f6adf1b98b144d5fe7fc9e SHA-1: 7960d64ed0b2996e5b977fb8afb04784af45a1f8 SHA-256: 905aa99efb11b4c9ce724626fc6486662e343fb6d9f087e6689b3de2d614c50f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=le+monde+en+marche+pdf PDF link annotation
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/28981687924.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/89091044692.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kivomej.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/ginonirabepiropelonuradam.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/62273417456.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xejadefuba.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/lesatetezojiw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9f5edfc25---29191288626.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/2577141444.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rd10p5aemf9iv6il5gdplu5kp5/65713786261.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbc66c787---98736274619.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/peboxezabimaziba.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0a83a9db---55780747723.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/vovakunimudumutumok.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/55576629219.pdfIn PDF document text
    • https://wrd13.com/force/file/11611921047.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf1f047bd---18827992247.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215bce9696---91927529518.pdfIn PDF document text
    • http://gyobel.itpublic/file/72444263379.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/13300065760.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5390437f58678bbc46df6ad9ec0f73fa/48243124775.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/mixowuzusoduk.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_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 21924 bytes
SHA-256: 34521838d80a97f6f406efb2101bd531b316fc93a812415d0de02ea54eddfdff
font_01_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 10440 bytes
SHA-256: 25fdcaf16f3d6ddf40e17bc2a2a7d84f04fbb34864e6e3e3ae777268da9def72
font_02_sfnt_off00014bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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