Malicious PDF — malware analysis report

Static analysis result for SHA-256 2708619938daa07f…

MALICIOUS

PDF

91.9 KB Created: 2021-09-16 03:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fff98c3f9594eee92dc7e16b3fe7cd6 SHA-1: 21ce2b0d2457c9215c223bb75fbab0379b363335 SHA-256: 2708619938daa07f03b432c6449308d0ef7cfef21c198ddac527f3dbeea210dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript, though not fully detailed, is a common vector for further exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://sarljarry.com/userfiles/file/tofasinexixinab.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbb2912f8.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xarajutanaw.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dupaxuwifazovakilodil.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/70184111475.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/jumajodofupox.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/silazuladiwidura.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/8622388710.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/10997026798.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ratakalojura.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68e1hdrb1o48b4m4883cactr33/60098842128.pdfIn PDF document text
    • http://prota.ru/upload/files/30158677837.pdfIn PDF document text
    • https://fishboat.hr/files/bikefabaxekezemunajor.pdfIn PDF document text
    • https://podimercrm.com/img/files/64725488856.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/duvavazepabijumake.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/jidibawaxuwisisivote.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613601644ed45---xelowadab.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kavubakuda.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/foravefalafavis.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/4518007165.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d88e0a0b1868792457a7305befa471ad/mawoxixepizok.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/36420839432.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xoxodadinaxukifijisisib.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zexuxebanelomekutawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+animation+source+codePDF 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_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10564 bytes
SHA-256: 735e6ff4934efad8041826bc055939b1c696414d12d9d380ba3d81ea4b374501
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 18684 bytes
SHA-256: 589bef09b2d5c3bc6750bfe194c4030940d352fd78d5706251d55b63b7eb1271
font_02_sfnt_off000149de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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