Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65a0cfe237b44fc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 17:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc139d6188971a30d2cf3ad242535109 SHA-1: 383cf3b2f1d22feb02210fac041dd79265835d0c SHA-256: c65a0cfe237b44fc1b1fd0c2addecc698e58008df764f40efca40d07a9c397e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7322127da---kixefogirateparubum.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zugadefigopibovurilikem.pdfIn PDF document text
    • http://stl-hk.net/userfiles/babuvenusujebirupupup.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160734ce10f767---zukepaxolodazunigoluja.pdfIn PDF document text
    • http://fittbike.hu/files/file/puwopumogudi.pdfIn PDF document text
    • http://eva.am/files/a9a1f5f46ff74f84.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/jowijotanefaradibarexovex.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jezal.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/jidodukolos.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/7166430621.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/fetur.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160affc853f62c---ruxitixoju.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07b84fe5d---98329039491.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/bedecbeebaad11a5358a715ab00d31aa/valudasaluwi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/firirumiwami.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/sizikopigademozunek.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/34444980965.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l8e42553ddjq9kise1eft9b0v4/fakikofa.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1dee2e05---mokesexanudoguz.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75888238305.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/sixujavifuxesizepufevi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/56530771963.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/35443510603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=buderus+gb142-24+service+manualPDF 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_off0000b480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 14492 bytes
SHA-256: 0fb0e441cf0c59073e708ff72c13bb5643f925d595c0060b1e56966779511419
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 11136 bytes
SHA-256: 7f267dfd26ce3306e13c066c2473f659503c6597b5f5d80b0f595abbfc11b86f

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