Malicious PDF — malware analysis report

Static analysis result for SHA-256 204c8ebe63d885c9…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a3c3873e22d740882c904d3fdcd0442 SHA-1: 39032a544d1b4a3d231a0becc2c0511091d98624 SHA-256: 204c8ebe63d885c98a70dac826c1a2d4cedbb0a75616063c76b6b4cf4036c8b7
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting domains, likely to host further malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://diysmart.net/userfiles/file/gasapejisosebop.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522233546503031.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee7b0237a---12836373927.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/92631697104.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16078feb673fd3---fuxemexuwogalefibijavo.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/4910023028.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c9687d14---53091753792.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/17347518538.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/54647195609.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2efacccda746a1203d1ac1e786cd6818/nuzimigudazurenerilobu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/583011374.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070156ea4e88---xometizagux.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d629b0b04bc---pomet.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e93fec084---kojemizikikexonozotuzon.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/72495657179.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bulaxazojegoruwu.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/limizefisekutubiwoxirajov.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/samumeninorogozijup.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/60440931866.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/laxiwanikodek.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a8ca6b7c2a998fee6917822dd86f3d4f/punatemuwepilazuwe.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/58223632752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=indie+rock+chord+progressionsPDF 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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 10528 bytes
SHA-256: ee4dce38db254283373cc3a630be69b9a3e46adad1566ffeba9399d6974407ee
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 17364 bytes
SHA-256: aaf3df5922450235bf64b4a57166d83031ef8b8f7c04db3ad051adaa6d198989
font_02_sfnt_off0001383b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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