Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb7ec8515f3ad7…

MALICIOUS

PDF

113.7 KB Created: 2021-09-05 15:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fc4154d033ff393faef85f6edac77be SHA-1: ff7d7319791c8c15a9917a3823aa8f1f6612fa61 SHA-256: 9fdb7ec8515f3ad7fc3ba1657156278d2adba60360fb50658c390eddb544d39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=sintering+definition+pdf PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o682kt2m7jpnjgg2m45ig8mng2/jilawoto.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj44ueaafd92o7m0n4p0jqtre0/6990795997.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/pajadusabaruvulotamuli.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/78158433697.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/26815704470.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105e1dd88b77---43898251574.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/1482575331.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/11974972982.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/46811860673.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/22200966980.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/17793963285.pdfIn PDF document text
    • http://3asoft.vn/img/files/28003385677.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/75105954367.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/6426520628.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/13019929920.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390b867d2b---49876674100.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/41005066054.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/21726685227.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c071bce2965---lubawerodogatemurire.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/16753652873.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16210580608962.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/95621675135e09f78fae74688413d1bf/somepo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/41f387313378253909f5da61d7f370c9/taweg.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4ab61f691---43025610143.pdfIn PDF document text
    • 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_off00015590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA2 19596 bytes
SHA-256: 720d396aab76d05c5ec49409cd12b10ea35a01730933d3ee9e04986d55bc74d1
font_02_sfnt_off0001a185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A185 10372 bytes
SHA-256: ca888ba8d70f3f8baff409e1983be73bf21725a1cde3c4c3ba2b1e864b4db1db

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