Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c09ffc7b42e29d6…

MALICIOUS

PDF

98.7 KB Created: 2021-07-20 04:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a852d7e95e7a03f7f225f87953009be4 SHA-1: 2d0d16e5a6398b85c91107a244a61fb8c0aed2e5 SHA-256: 1c09ffc7b42e29d6194848deaa0661dccf7e4ad8109e024cb7772cf521c3ea21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8c6b1da6---xafuwukududuwafidanivir.pdf In PDF document text
    • http://indecomavo.pl/inc/83621437729.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65640c6732---tabadadelefe.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/funironemar.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/wulumumosibiviforaxus.pdfIn PDF document text
    • http://canvangdientu.com/images/file/bebekubefu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/sijugisolijabexu.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kesizolixawoputod.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a3f224a1e2ad217a55a5bf9b60caae3c/kukoladozunow.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/59003147391.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0ggmkpv2ah2afvrmndhvck1mft/wisofixawepekigulusuxined.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f013345077d---bajoteluxa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86afd3f8b---vogixabef.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tororimuwavevumazizomos.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8eb4cb818c62df1a0cd038391887425f/fumodusulufute.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/jineludirixeviwiripekasi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgcga5llktd8bdnr6vm6gfki75/jadufaxidezalufetide.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/87108746206.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa14d7775---6306336513.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/bfdd9e9670a21f8378b04a55e84df938/28676428891.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/39781225357.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/01294e033a4093177b3dc485a7856242/1794401257.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b50ecac56---58395720149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+hunger+games+in+chronological+orderPDF 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_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 10780 bytes
SHA-256: a9f36710a0429d60c0d01c1b442d9469f04c6523175a2ea749bcf48eddf0683d
font_01_sfnt_off000139c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C8 17116 bytes
SHA-256: c650f18f52e61829ca5d1479906c5aa69daa450abd46d8827a37f105a9a71332
font_02_sfnt_off0001656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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