Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea55e42e8b5de32…

MALICIOUS

PDF

91.8 KB Created: 2021-09-07 05:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79500669cbdf41546c3a74c96e6de4b3 SHA-1: 295a6a70fe9fbe7dcb01daa83198b2de3c09939f SHA-256: fea55e42e8b5de32fb8a18e810c79206aaf408a9e1b7f9adb35a3dd5406ccf83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=smarter+balanced+practice+test+pdf+5th+grade PDF link annotation
    • http://nzozkrowodrza.pl/uploads/editor/file/fubelaxibenemilo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pejopugopuvorer.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/gebuzexid.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/72746848155.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/6696301722.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e44ddfe3e---zoxinogazexomitusajatit.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094919026b52---87344750342.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/nufufugisusonideno.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/65726698548.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4342168d44d1566cc99b80de1885748d/56434064503.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/munexudoga.pdfIn PDF document text
    • http://jucal.es/images/file/wojunupixo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d736de6849dea7e2dd1af294c8881c20/judixaluvowerilosoxuza.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/10275576124.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/bawuzaxakezusuporo.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/dararalikawujo.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/vuxafomafu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/btefkcbh9jf7oil4s34s5ltro2/sewowoxatugerisibiwi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/budobila.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2697b1e91f---69409012530.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/1811915314.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d88c72f9d---gifilexekoduxazetavunenu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4851b3e4---lutifibutetigizumido.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160840d64a89f4---pibuzadupafokudukib.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_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 11296 bytes
SHA-256: b0d40d5e0d8c68bad3847c793fb7f8c9053e8b03596b164c3af5a5d5c16e8001
font_02_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 18340 bytes
SHA-256: 13d8136b4b349913c7d4357fd5c0e1e2e40c7ba7f866c7a7ef422205988cd6d1

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