Malicious PDF — malware analysis report

Static analysis result for SHA-256 35866ab6f17dbd1a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 12:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd5ada341fef7d0deb205fe9f1395389 SHA-1: 89f4ffde5ee7ef4953060b5c489f09cfab88d48c SHA-256: 35866ab6f17dbd1ac0590c6503c41288aef8d8fffb53a66b405a479726812321
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering attempt to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=pdf+to+rtf+online+free PDF link annotation
    • http://tecniagua.es/uploads/ckfinder/files/zaximuxusuzifexejakub.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/sadonas.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jezus.pdfIn PDF document text
    • http://mc-opony.pl/files/file/senobawolodafi.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/39277319803.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/35fb6005c3db6285719f27ef53df4779/xomiletumiroxazuluxipixi.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/49435817148.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/59484622005.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/60470729620.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/20923760059.pdfIn PDF document text
    • https://media-get.com/userfiles/files/ronalugi.pdfIn PDF document text
    • http://gysanya.com/upload/file/210906194654318090bjt19urmt809.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108311818176253.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161643101069.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/womiwavipobatubifov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613422cb392d0---nemudoxasemozuzijarovi.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/29767784952.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/86150846561.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78u33t6cgunfnmi8u0v0gha446/25631588417.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/17227707221.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/36161411723.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/porimefefaf.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/52744796715.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 17460 bytes
SHA-256: a158b423b1d13358e708cb8e60a34085cd2a23d37c673f8685a959d34cd0f49c
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10020 bytes
SHA-256: aaa1a85c9643e55d34ea2fb2b318a8152ab5ad7d9ac32c41649e9d2343b2393e
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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