Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a83225be9800a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 12:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26d57e81514629634a2c18c2fead3ff9 SHA-1: 88bd4de7b1ce8a1df124d73b2c7347ca3a5d5224 SHA-256: e66a83225be9800a8698c0299dccf45d8db8cdf3887ad808faf5e2be907a7866
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tuzoltosagmihald.hu/userfiles/file/xewepinutipafe.pdf In PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/zopuzibule.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/jefewodisomewujinujavavud.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/makatumazunowafitikozo.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xazomezal.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/210902063500679422pc0xoee6bk2t.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/70673045542.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/wevaziz.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78298007075.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ecd1a2db---wiludunozedalo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/66032315992.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5lmlqup3pho593mli5u7mi9ip4/57742943679.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sukix.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fejozaxexudixete.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/golaboreximadasa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gekimobenopixupexame.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/25592554742.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/wobofuxawozenaneduvetav.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a61839638f---ralenigelinonur.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/71963568930.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/75687525261.pdfIn PDF document text
    • https://oasis-travel.ro/files/50490329574.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/daxafupisumixuxe.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210903_7E972268FA32CBE9.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/genum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=disney+hotstar+mod+appPDF 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_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 17004 bytes
SHA-256: 44d7dbb3017801cfcd1c5ab4b782c0ca74f67df2a8ddc73fd879e09e0957dfbc
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 10728 bytes
SHA-256: 0822a1c92366854ad4f04e747409d452714ee838c75c9172a0ffb147d9e54fa7