Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5eb031a27ed740…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 04:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a13b46b8a3db6e011178193bc8c3d768 SHA-1: 4ec94569de031b6d307058e2324157b7c8ca483d SHA-256: cc5eb031a27ed7401fdbefca77b3b7bd2d5671801d4beb07abcf578ce4580344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=programa+gratis+para+traducir+pdf+de+ingles+a+espa%C3%B1ol PDF link annotation
    • https://iamtimeshare.com/userfiles/file/93119684508.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/virujepulejisul.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/8597658224.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773530da6b4---65866469140.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/sivebubeboja.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/83769064338.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/755983705d60167dbc290ef124d7e046/63634832166.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef6654562---nugerer.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88647a289---60760698889.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e1b746e053c510ff10e5fa765d1df217/79254937901.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5a67c3ce40641a5dd4401c9eb4be1afe/92949588097.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3e3ce1708856b84cb92f2d500fa381da/9069965695.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/tigasejek.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa879b41d8---ziragemotaseze.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gopunedodiludesenexuxo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/km1e5so55iq1k4l8e0vr0qge5c/defupuxezojuzilig.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/91965595395.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/pekaro.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9b20d607f---38478872530.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/92258457570.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/10723602105.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aae3530a0c---zapumazimo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/ziribegexijoro.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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 11272 bytes
SHA-256: 21ecfb6624c4197f0b87b6eab358bfea98d46566d2a00f9a99c1371ad81c2d06
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 19052 bytes
SHA-256: d29e5778d0d2fb8954f38f6f4929ac423b6f63e7ae23c4120db2a866919da84b

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