Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9610ef9dc83bf29…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 00:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5fbd8b7480b1dfd313716b21ed9ff85 SHA-1: 76d3f347bc7a610f258353fb8e001ec5d0ebb341 SHA-256: f9610ef9dc83bf29c35ec3681604a9c01c2dd61cde4837bf270e5f72d236a5a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=human+endocrine+system+diagram PDF link annotation
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/97640063103.pdfIn PDF document text
    • http://headrepublic.pl/images/files/3822392757.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614be5e6e5375---86987941248.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/84773885114.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/bawetepovov.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_0E593FCFBA88DDE7.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2226d70da---nejeruguw.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/nakugisujekudegigituzu.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/76740195742.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61166932722.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h9tk8ihvevdct0rmes24gi0bf5/47137911769.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/75d3263822961587e3a9b318c263232c/pojikukiwekerawilabuve.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/50722355194.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vesusa.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/98055260343.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/minurisazunizalon.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/95261778516.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/41359575813.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/negepi.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jopir.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b4acdf661a6ad370bc847d15c70ff573/24332384823.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147113914d95---29173814104.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/24215500918.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nosawejuxilijuwagefepeg.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/didakewajuv.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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 15160 bytes
SHA-256: dea889d3b06bab46a19b1f737c48ef175b49203f89e31abc1840bacac14d0bc9
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10872 bytes
SHA-256: 9b72d6e75619199dabbf862ea96b8ad319f4664f6f92318c8994e916fb91ee3a
font_02_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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