Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c064226eb93b98…

MALICIOUS

PDF

88.0 KB Created: 2021-08-02 01:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b4cc97dd3381465b22a91e2d943e263 SHA-1: 662b0326337d71af5c6d841cf8ab1d056d5c5e26 SHA-256: d7c064226eb93b98d7b1fe61ed01ba93ecdb2cce387b0a68cfa65541c8eb16fc
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=divisiones+de+una+cifra+para+ni%C3%B1os+de+primaria PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/21136839d8c6632edf2dd39e2abb7f6d/8488153835.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b58230e55e89e01fd6401c1a039dd067/piralujanivigivinefo.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/woruzetewuzo.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/9184820749.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ce4d5ae66bcc1f201e2bfcbe3dbecd3a/sututifiterudujupig.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd11b7c8d5---36335773910.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/14679635301.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5ef64e5eded63b8dc8fb052977a4699b/timurenunikob.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607929e37ceb5---19131239958.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/misozekevaxedikuxipa.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/rapiver.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/posibodixamofidimukowa.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/farawakabeb.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aad832e---minerururudasavesof.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/796e7716944773c8d665e6fc4d5c8abc/jononisikulibemirarozi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/lawijavuteji.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/56199139085.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ba1e7151ea72294c67368a6fdfced16a/vemipam.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5e1e0f3433576819eed61e424205c5ea/xogavasikalafe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e75e7cbf016---48464343484.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5ad64baa021cc1e110bcf987e526e9f8/silidak.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/bdf9835473bc555b911e81895e4f6def/fedanipubenilanosot.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/86520509110.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f78c5fab6858b1dd697df293d24cd450/madafikusifazijened.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_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 19264 bytes
SHA-256: 84aced140358b86fd5033230b2e15d7907f6e8e5851fe455dc554080e2cde0d3
font_01_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 11012 bytes
SHA-256: 6d349c3e86ecfe1562b36ef70b575486e6a9d832f16ba2c3ff91fe01fc9a6ae0
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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