Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b9cd4fcc7e4b5e…

MALICIOUS

PDF

157.0 KB Created: 2021-08-25 17:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f6b180f65813477a9711a7bdcf31d848 SHA-1: 00d8f1c127fdb88514a21224d7029e89e0648700 SHA-256: 72b9cd4fcc7e4b5e6bd940f9cb0bf4e5dad490b894da69fc817bdcbd68fea64f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://service-panev.com/userfiles/xepip.pdf In PDF document text
    • http://tutek.eu/userfiles/file/11656351520.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/44475452808.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/151b748e76ed93b6adb2365229605948/wuwutawelizorasomarari.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/878f2f5bb35b803b4e2ee6008de17085/tufubowa.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4e0b4cc9d72054530602180210bc9e5f/mirovoraxozalorajulokoxi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vitibolokafojajebekuzalu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xotulonuferotolo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050400582073499.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086638ef13f9---8162984328.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e00104852b---61603855593.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ed215dd1---37264889596.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/5242219559.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/86209467816.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/rilevarasuwebeb.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/85152632565.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/kevukedoxo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/23066802027.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/63b784cdf9505d08ab86ddb824aaf05a/widipopusofov.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf1e78fd6---51494227074.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/95571234354.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/52890876091.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/90241135113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=highest+rated+movies+of+2020PDF 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_off0002040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2040E 10952 bytes
SHA-256: 12d344eaefb5637ec974800830e81b6eadf3bb3dd939fe78bfab09b4ec379a47
font_01_sfnt_off00021d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D4D 19352 bytes
SHA-256: 0a20833c844e25732be9a661e6dfe2542858731fb2d970242520fb5178cf634d
font_02_sfnt_off00024da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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