Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bcde02fb6fd205…

MALICIOUS

PDF

61.1 KB Created: 2021-09-25 13:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3165e93c9aa9026afd182345085f03c7 SHA-1: 339751f259b512ba517bd43afb65e6e16a0864fa SHA-256: c4bcde02fb6fd205a15925a3015be4ba9180d66bbd7f034c1c916e90fc050fdc
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6753

Heuristics 6

  • 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
  • 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=star+plus+download+apk PDF link annotation
    • http://whuntex.info/userfiles/file/lodubuxovukowatapibudoj.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/68255598457.pdfIn PDF document text
    • https://shevian.com/images/file/45833526851.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/duroratoguseso.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161342ee24c64a---33841090759.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/93972963604.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1cf890711---xowepokewazirarasa.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/monezotepidepokeminimo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613518595e898---52263278199.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc9d713782---8725955440.pdfIn PDF document text
    • https://kawanmto.net/contents/files/61500543272.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gafifikoxen.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/sasumoxopixebonov.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/surebefipi.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58220038798.pdfIn PDF document text
    • http://videlec.be/ressource/file/gakabikezafabunigenuloj.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/tusuma.pdfIn PDF document text
    • http://lawngo.net/fckfiles/61611178475.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137442563170---30705387486.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/retevaxisokabixagona.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/piwunedimivotubexerot.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 16500 bytes
SHA-256: 01a9c10794e904ac1aef4af5c0c7e1c75ca07068f993c324bc7891627e692e48

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