Malicious PDF — malware analysis report

Static analysis result for SHA-256 10efd0608db953bc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 17:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3a13bff23a8e0f40b213d7b6ac614f9 SHA-1: adb33b3d9f4c93e62f9608fcebe48b8e38c44394 SHA-256: 10efd0608db953bc92e48da4ee45cf8d8e400df4f7763722b33e00c171236023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://afghansolar.com/userfiles/file/vubune.pdf In PDF document text
    • http://vinhthuan.com/upload/files/vorurodogikebopadawofoji.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/xisolebidikevububa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd011d4d08---gilalipofidewiluv.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26d27044fb---88872025760.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/lubevodemeg.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/zisinusepuxavebopezon.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/444be0953d2276a7bda228c2ad289ce4/77421564261.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/73300705123.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/zofiwa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/20376224149.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e10663f1c---89742812774.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160865453b8b46---mojosizev.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8060b6d17---wagoreweviwukovez.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/virakavumeda.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a370803f50b---weketabu.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/19617393423.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/limujasalox.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/kosuwirafazavedibuxirozan.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/38782438932.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/rovidolabalikakewaxozana.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/31833527805.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/84440144270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solar+system+model+project+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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 18136 bytes
SHA-256: e2171cc9e06066bc1f6f3d0cbdb229bd5179ac78da59efa37ddd265f93f69cf4
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 10904 bytes
SHA-256: ffb12b68fd7b45ca2c5094c5c21cf8d10b0fd7cce1374b62bb78622c3a2ae2a0

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