Malicious PDF — malware analysis report

Static analysis result for SHA-256 725045fa7ed73041…

MALICIOUS

PDF

102.5 KB Created: 2021-07-07 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c1787ff802ac11eb8c8974f8eba8f54a SHA-1: d58ddce0fd20befd248496afa1b109379b797eb6 SHA-256: 725045fa7ed73041dc3a6e1e29e5bb4d329a2b061ac75be1402436bbb655820e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81230089---36394014224.pdf In PDF document text
    • http://omni-links.com/images/blog//file/guvuxozutimaso.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/28446028911.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/90190276918.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081b862c3589---wefogilamisit.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/67706114458.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tl72pjarknf4u1cctfrqsfhgq1/62763997774.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5917530e9c---75583568410.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/88950145715.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fnc8lemng3si64f3palg9lkvpl/kowaki.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec15afacd---18379800118.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b22889c68---zawevatakumakasomidukubiv.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/07961f1e2fb4b0d90100537001d36897/mogelivajimogarilexak.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf333a58890---ximenojulorenobiwotoj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n1jfcpvhfmtsndp7il6gupq9j0/90681001509.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/47147799534.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/temumazirabadekapodimaz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/19a8ffb7ce0ca3d6d1418ca37215d60d/92046117947.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/78254433021.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/8675573767.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/82917316061.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773653b4980---58551024851.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/88395091284.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb317349e---39955330720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+after+effects+cc+2019+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 30568 bytes
SHA-256: 9805fec432b11bb0eaeaee1df7172c561265343d2839be8861af8ac57128206a
font_01_sfnt_off000142d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEC 11372 bytes
SHA-256: 7786302592e0641c151678955f0a2f4621955520ce93ed9e5efd85dd067a2e0d
font_03_sfnt_off00017595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17595 16396 bytes
SHA-256: f7f02f05e5b203e0ce593daf1016da8aefd215c2e67f524f014a383ad0553bdc

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