Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2333afaac90251…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 18:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 906917e938fcb498f53e9288d9734742 SHA-1: 594c8b0038aedcc9f2cee1b48eb75b70b0aa032c SHA-256: 8a2333afaac90251e56aff878ec0bb4ca779dabf2b95785255b703220e17aade
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple compromised websites, likely to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The heuristics suggest the document is designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e240e320bff---letonunejoxik.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b436e826---mefawurekaxagejazemop.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/260941365044.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zaretituri.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/denok.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3100e7c0---7499337508.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/34923786190.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/23934715829.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/54764918698.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074c5ac1b4---17834960488.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/59114581681.pdfIn PDF document text
    • http://www.pilartangguh.com/file/78814941971.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/nanivelejujurometatili.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/8991040996.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20c297ca8---zorepekiruledexelu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/16159976054.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/kuwoxafanupajenatuzefas.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086990a2e68a---45449904290.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xapisurirobewizov.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120468ac2eea---sisunigeg.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83a9064d7b---90730558688.pdfIn PDF document text
    • http://msiutilities.biz/documents/19344820401.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/89795374774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acalasia+definicion+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_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 17460 bytes
SHA-256: f9234c3d137c6ca7bfc869a1c24831e1c446eb03110e3de501a7f67d0cd0113a
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10396 bytes
SHA-256: 8752bf1b768b73857e9c3158d03a207cc138281475ef678c8955bd19d7e49780
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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