Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d57e50161c5332d…

MALICIOUS

PDF

88.1 KB Created: 2021-08-14 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53aee4cd7d347ea01772ef5c5319a665 SHA-1: 2d08a756a0435d31fa57989b2420d5952a886105 SHA-256: 6d57e50161c5332d0ae190d8fc092ff27691d2822dd2c121cf1b615eee633c3b
164 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised websites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sfasg.jp/js/ckfinder/userfiles/files/60051647527.pdf In PDF document text
    • https://totounited.com/contents//files/fokabigesipawa.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/kuripasegijoripezijo.pdfIn PDF document text
    • http://rld-carbon.ru/file/ditaguvaxatubipodexebof.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/56059359656.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cf2ac8a7af2800a9845effb11d34bf0d/20094604325.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/69670371733.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dagivetefitulunilifoput.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/dufemulunolajapekizesuxe.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/pesapuvogugep.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/51152716362.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad667cf96---silatejiwugodunarel.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/991374402.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160792e25c9e13---wadavusuwizeti.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8461dae7706048c24f67de215bc63308/balejutafodavibefunolot.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a2040045---pidipab.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jemaxofisudelezoronagomel.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tj9vn3ab77nm19u0bpdlg8r6h6/39752016883.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8460d2341---pawekudexovudedakoxujo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094c849ba53a---6914280488.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/88537150468.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/fuwenoxiwukonipefeve.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/titawozipumobugot.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085567cad797---segijejababodefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+vocabulary+learning+strategiesPDF 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_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 10888 bytes
SHA-256: 7d02b92dd3d37d19e6f63a7013f833b108b927b8d98bfa27b0901bde580e05bb
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16640 bytes
SHA-256: eb6ccbf5c609688e1f8b509254954ba129df74f7ad72f779893829ec8b2fe994

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