Malicious PDF — malware analysis report

Static analysis result for SHA-256 473ec9c307fc809f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 19:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d82d66898b13afebd360cbc271bf575 SHA-1: 0e48dff468a5385f1f1c54f0efcaee7ef354d1cb SHA-256: 473ec9c307fc809f77570cb334d8aaf2c8653a846bf6640a2075b2303fc1e429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=audre+lorde+sister+outsider+essays+and+speeches+pdf PDF link annotation
    • https://pezenasenchantee.fr/userfiles/file/pisumofin.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133874708e15---90969906381.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/jevovavazus.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/denup.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dus9pp6j3n0or215597knt2c01/84327431507.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090413492973499.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/votuxagufiru.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/90501979292.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109061516161781.pdfIn PDF document text
    • http://makaroma.fr/upload/file/75625219330.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/rekog.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sadosaverefi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5c406d22---42673150765.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16136a492aaf4f---mimawugiwekenibupoximak.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdb111ffe---zazidenu.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84706729178.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/pederawe.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/92282449429.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/zomegifotesobevetol.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/93930006463.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/safejuvemu.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/3074284287.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 18672 bytes
SHA-256: fdefe5a81ccb0c84e22d9204000df76ade39c0fd8eaa97b95329d47aeabc01d6
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10912 bytes
SHA-256: 9e7de563e4deff48219b5320c26b7f76e2e70c053d9c929d576bf67af0e02caf
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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