Malicious PDF — malware analysis report

Static analysis result for SHA-256 a225c8515df6aad9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 12:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8df8bc64655d5b0988b01cfee8d28583 SHA-1: 01197bba10a6a3482456418f5e1204a6397db596 SHA-256: a225c8515df6aad94c2aaca1b78a05245e289d4225715b37571c52d32cfc67b4
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 compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://librojuridico.com/aym_images/files/gejegegaz.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/9243315490.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zegejir.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/33659f31f7f4d005b0b70e08a95dc508/96859202967.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gelemirugegidosasurire.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pivupu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614122df967bc---2614163408.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/34b97509f9dcf42f4dd5eaf0118ef781/ninowufi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613697003aabb---97121828363.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/mudurezosuzawedidijosov.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8fd8c2bc75c4f1010aec0a7f47da1573/68340308410.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/11172765289.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/84802969771.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3c433fb1---menuzasanexowabunusunove.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109011805219991.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fotes.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/96636369327.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/3629787477.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15c52387f---tuponidekoveruzebolitisu.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/meniru.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/99563061053.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/kosawejatixadedajorizud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+can+you+do+with+cobblestone+in+minecraftPDF 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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 17724 bytes
SHA-256: d884f0931eb6a5974ebcd550e1bab7c9225e3aed259d9d14df297117f17305c9
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 11172 bytes
SHA-256: 5c4760237ee96e92e6811df319c052e183c4774810f07a9805822e55560ff8d3
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.