Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e77bf22e8feaa4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 16:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdc0e65bc2ff7037ee3cb5e2ee48d577 SHA-1: ed0413dd0dcbd22228e78a2c75ebd9d643a11327 SHA-256: 67e77bf22e8feaa4d04c8634b364353212f3d09c9f0f1c62cf4f76ebdc04b3e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on potentially compromised CMS upload storage reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/247a154ccb05aa41016ab4682065e0be/mawerudopavuzixubo.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f68e9ee33---xusukalexunajure.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6293bca8af29408e44a766a48b7b9ced/43274377565.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/takem.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/rokoxovexosikewebit.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/88562088419.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210804013125446162.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ilag1rv7ndbgbaejjifcimldpa/94871946612.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3494a993d---xunebafubagororinineme.pdfIn PDF document text
    • http://twilaw.com/files/files/mapox.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/ninibunifotidaliwuwijime.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608759fea740f---vakumis.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10670311b1c0b1c02bf665d6ddd081f8/jigijuwinexepuzozetofez.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/88519506941.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/26942785153.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/88991846210.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mndcfif7jjdc5nvvkf56m74ntj/xateki.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/f5eh3nq2p7qu3llg0r6pljsoeg/xilulobo.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/40399085328.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/gedigixutekugesamopewuso.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rhqb9nnepn1lbbd439mt9e77sp/dugokuzopaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=braille+sense+u2+mini+manualPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16800 bytes
SHA-256: 6ca5c509a75a891d92f9e6ebe95fb04a722cc5e026bbba0f695796aeb085200b
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 10324 bytes
SHA-256: 40e51028cbbe335220e5f6c98975e10c20c0cdae73c11e90cac166e47b19a2ea

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