Malicious PDF — malware analysis report

Static analysis result for SHA-256 958989ae3c835876…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 779e298497087c048bceadb3faa094b8 SHA-1: 79afce961148a01914c7ef50fe010b5a339320d9 SHA-256: 958989ae3c8358763f1e3fd9d0f6d7a85120b12cea0129d89ffab53390a05da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ellissi.org/userfiles/files/5647372604.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6819c1549eb0a3fee471a5a5afa19d2e/xikaxiwadex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7a5527d6---zalesuxuropakixivavorojab.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/45379041346.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210624075711_2kxmbb.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/64253701669.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/59235854476.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e77f1938db6---terisixurufupa.pdfIn PDF document text
    • http://mobilenmr.com/files/files/47630553126.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a439cdb89---xefidir.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/91228201681.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816b26c97e0---fafubojikas.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/35030875088.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0uah1rp2sh586v9mt54draqmpp/xuxodofakatetuw.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/joviwijelitezutatukuparuf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3e1fea4200e0b6101f95f5a09940a67c/28419094561.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2e505c66f6c107d2cc064bd5d3bcadd/93949275938.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/39292956103.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d6d05995ecfb6705bc89672b0d1754e6/43043416445.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/87549083708.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4de14234---loxofizuxidomime.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mediwejizifowukelelono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=prince2+process+flow+diagram+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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 17704 bytes
SHA-256: dc96bbb82b7ed44c012ba863ea6da3913fc16434534a740b389a460b930ba8ba
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 11072 bytes
SHA-256: 92dc85136c25aad229dc84bc777fea126980f0e78eb76f263186cd92840cd2b8
font_02_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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