Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48727a50b658d02…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 05:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cfe929ec2851a5e848f12bf8dee979d SHA-1: c0d09a39de219d3f2524f2d3fddba14f0026a461 SHA-256: c48727a50b658d02f71a3db5b84e83543b7c937b0c0824c12eb2f13d10e4c1f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting. This indicates the file is likely part of a phishing campaign or a malicious redirection chain designed to lead the user to a harmful site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://ketchas.ru/uplcv?utm_term=define+human+wellbeing PDF link annotation
    • http://leaguengn.com/userfiles/file///dapexabo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/75588053770.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wotiwiludapufebexiv.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/235071589.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/23001878641.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/69713517032.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/36160284774.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613304a6b2625---nuzosopijum.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/44500485943.pdfIn PDF document text
    • http://parateam.cz/file/54994150512.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lomibowimo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/ferutovizo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_C022F822CF8652D5.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364159ec05b---45943255727.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/61288285749.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631377855.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/24380102747.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/gumirepedusobixu.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/giliruguwazev.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73034316837.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ugbcacfv2f1ipuead0vrabv1u/13620019805.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/8627255142.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26471253091.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/17398248334.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd8345bcb---gakafogizorukok.pdfIn PDF document text
    • http://hla.vn/upload/files/69068108227.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_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 17208 bytes
SHA-256: 1b98cf53dd1b2cd28dd2ebb32b3ecb301ac22e80b59a763414b91b2015db2443
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 10500 bytes
SHA-256: 35ed0a8dc3490b0e7a957240dd519fce4a153670325b650229a6340efbbf2429

Open this report in the interactive analyzer, or submit your own file for analysis.