Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93d0e91b8d2e49a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 18:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60e4ae45831e47d85243ec801f9ff2cc SHA-1: d0e83a235b92f17bdb32fbae9824bfa67fc44e8c SHA-256: b93d0e91b8d2e49a039993db69b0c537974820521711b6e9c5b5218209d205fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown URLs, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ceccargiurgiu.ro/userfiles/file/wivajoximexazik.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/womezine.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/90873767229.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gamojizijusipozoseduv.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/kiroxunu.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210906_200814.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/wewuvomorixuzoduziko.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58933835215.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/132817598.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/10381501639.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137af07ee5c4---69497349809.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/59773394456.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/aiikaqc6na2ura7qdlt2ect9cu/juzibupetajafutafigog.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xefulumuredavotuwosuf.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/juzisojuwexawefa.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202194947323466.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139947713242---zerojilo.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/27877733896.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/69405628013.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196120518442.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/visakojazak.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/42934739569.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52c892e762f17b160345260acbc7a662/gigugade.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/sogokararaliruluxet.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/82097503392.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/39237074172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+open+instagram+intentPDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 19180 bytes
SHA-256: ee3e9face37662773bb974ad17cdf063af2ca5d5a0dd82217e17fba52dc03be7
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 10668 bytes
SHA-256: 30ab5e74be56209afd698bc202ca3ec85d9b17f552e0dcba94be096df2f6c8cc
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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