Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0ef0a556f80d2d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 14:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b895faf1105658000203e56e91893c5 SHA-1: 526cb48445b15842f27da5795a1f043478b141a9 SHA-256: 3a0ef0a556f80d2d6d64294afae2bee9b5f612f8f7fdef661dd1fcfece206351
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://manpukuorder.com/uploads/files/lisotibilegipenosu.pdf In PDF document text
    • http://casaperugia.fr/userfiles/file/matipagaxo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff272cad4---38347444381.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/63657338660.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/sukudibor.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/54482963658.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/xatajunuwofobajeme.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/jivoxobila.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/84880009960.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/22947421326.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17053355651.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_180137.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zuwid.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/90762261752.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/vifegijanabapoxidafiwi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde9cdcc9---bofedivututepobinisewanon.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35157059805.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/xavebafewenumatejo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78e2dab9---jedizutemi.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/7550581431.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/bisomalewemetivodeno.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/36227721755.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/nuwebasutinu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e234ad63ca7b2c5530f2e994d241a30c/2664171648.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wujagigafuka.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/muziremikatalejewosena.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a169fc0e2e---99666854203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=video+star+apk+download+android+2019PDF 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10996 bytes
SHA-256: f4bb86bb90ee62a66e0df4253e65cb909426abc51dd4d3002dbdfc4748b8992a
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 17860 bytes
SHA-256: bdbd16a2e6de28950baf5a286ba3d11c3446dae6680fce9a9c2801cee6992598
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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