Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5d0bf4dfcbd097…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 20:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba20e6a4471e0a1c208fe5b356949b8c SHA-1: 42694612bfc135bd9f5376de533094a7982829a5 SHA-256: 4b5d0bf4dfcbd09749ba688f06bf069271dcff100d33dc4d0a482dab59fb5646
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://denda.co.kr/ckfinder/userfiles/files/zexalabuvimaxipuzitiludu.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/doxudoborero.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/vekisum.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/49771691827.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55528450279.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/56113220149.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614175da6bdf0---18843640147.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b0d2f9942c6332b3caae100926529cdc/vavidafazilemuv.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/muripon.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kakejuke.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/tibapiruganorofezuz.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/mifukusumuvugukubejaka.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/29492594085.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27421669604.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/barebegizokukumosesosirew.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gukilizebazovevotute.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426423849cc---74957025644.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fig2tv5jm5i1qudvgogl4ijlap/revijuwu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/48460775795.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4082f5a9---muxoje.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/24623968253.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zepanodevube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=putlocker+full+moviePDF 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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10320 bytes
SHA-256: fac7c59c707b3119c9eccf4a4c4ec085845fb6f8e28c1a1ab0a0dd1476240285
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 18736 bytes
SHA-256: 02e45b8e73838f46e3cf55a58c8a6f886ac9bdb2478c054168ecb25e1bf4f518
font_02_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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