Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a17063baa26e2ff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 15:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fdce0f50a908d43192722bed0e7551b SHA-1: 82ed201716f1021be05f44bc06e24c0ab67c07d6 SHA-256: 7a17063baa26e2ff0b64a260fb7ac44f3e014082652622a5914d99482f84e453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure points to a malicious PDF designed to lead users to compromised or malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954f9295658---vetuligajetiten.pdf In PDF document text
    • https://global-brand.net/userfiles/files/fenuvefudi.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/73049874220.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/75214274252.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/zufiwubezuxov.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7118052b5---zuferuxosamo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c686e7b72b8---kebotewed.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/fatepemisawowemi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/08f13cd8ad121a2597583703433a73e9/88462487849.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a10f413da---dabujoponorezezarasugupam.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/42104871233.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7vrug8c5aqeg6fp54859sq9l46/kunorudujutajaladadotax.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608502e7d63ba---31442615968.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/momalaloguvemuvilokalur.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gavubugibiwefirebomapipo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35e2798ec---29688144686.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/49139412439.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tuvako.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/21141283786.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc85133aff---jesebujebunakij.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7f1834d40---65987237696.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/finisisaguse.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d96no3seudeafk8ujs1hidsta5/22764751220.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sajijakukemugerex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=big+arms+workout+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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10888 bytes
SHA-256: 95a9632411fe06c4149985a22dc75fe9c74a1a830aa59a05f6cf6e3fbbf4e99a
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 17488 bytes
SHA-256: 06c76d5a347f1ac87b5e6e15de6752719f0d60eb7d36092958759c9ddbeb46cb
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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