Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b495239d395c11…

MALICIOUS

PDF

91.4 KB Created: 2021-08-25 09:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f33a3e59149a5d666fb9f8a9b3bf071 SHA-1: bec898845bdf6fa8d4c4c4ca0619a5eea69ee8a4 SHA-256: c3b495239d395c117ac89afd5326f1cbc446860478b8bf2b9422276cadf4dee4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://tktravelkorea.com/FileData/ckfinder/files/20210716_9E614F6977F489E6.pdf In PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/24075498283.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/11038069235.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fe524db6---gonexisusop.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/he1fkppfbjb6mn5l7gneiamp0n/49411595620.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nivikasarozamoxevo.pdfIn PDF document text
    • http://uco-kampen.com/media/files/milimerikevonor.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0d19eb18---48694834712.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/gizedizevodofuf.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/75243961228.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vezumirizokiwe.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/niwunuroderozixugali.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461685c768---80731460203.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0587725d---jaromexubibonini.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108022130175497.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/31039743955.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/bea6e32f6734730ed652c7a0d5cd4567/19230031221.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087078f39120---gelulemez.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/wipuwulugiwipa.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/100101417194.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/41607833407.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/51373328299.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nolifo.pdfIn PDF document text
    • http://hydrem.ru/images/file/8765700182.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd5595d38---nomile.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/savebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=leukocytosis+after+blood+transfusionPDF 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_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16304 bytes
SHA-256: 025cbf2b4093f9d6ee99e86c8a26b7d6a9683032b0f6057c3873d3e73adc5329
font_02_sfnt_off00014517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 10872 bytes
SHA-256: 490da9c3bf0eebfc81c2981d1826d499c17e2a0d71f9d2312134a175c45aac94

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