Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7edf8e3f5c52db3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 22:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 96b49e14f25fc460ef4a90c9831faa06 SHA-1: c0ff173911ae6778265c72b4e070d991c1e0e5ed SHA-256: c7edf8e3f5c52db3893701cb493dc6c60afcc6584fb98e205dc461bc08d48c0d
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://sanxuattrucauthangkinh.com/Images_upload/files/93540887481.pdf In PDF document text
    • https://etevent.itweald.com/uploads/files/612caf250359d.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/26879175097.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///25172955251.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1876351af---xabakakadisajutoleg.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/85047217183.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/divokunevif.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/b7uv5qkh84hfvm372rto5nntv2/watuzefezusomokivor.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/80259328444.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/43244103167.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/togabiruziguvutisulaweli.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/26693514245.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd2b4eea97---30195723105.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/vuvuferereliludanonilezuv.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096823a8092e---34311967703.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16092602506108---lixitipidakesokowuvige.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gemidulinunavewafuwi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9927665c---52055964264.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/19097441681.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/74df4109d48ab419fcfc679528730e44/39862464370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=star+delta+control+circuit+with+timerPDF 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_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 16540 bytes
SHA-256: 69e858e036d563c028d88351958dee4e34752a27805d806dce5f3947f30b8dc3
font_01_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10728 bytes
SHA-256: ec39822777a96de5628f18d3f1a27951b3e185557e3cb00a2a40b95ccae8c9ec