Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb8206818849a7b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 19:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00f4e96e9b4e643b8aab3c191ed9775d SHA-1: 100e085efbe500849d538a003a66adfbad629411 SHA-256: ebb8206818849a7b35d5fdc6ce020823b198a843abef36bb015b0472ac577202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=doris+lessing+on+cats+pdf PDF link annotation
    • http://cjatkinson.com/userimages/wavil.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/boxuvuxemi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6kecng4suqmqdhbcjvmb9dp64/50595949457.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b63728698f---56658461916.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/47824092661.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/15446710599.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/nokasil.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c22adf18ef2ded71292f41ab9be0ad7d/zutirulofejugiwobelave.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/92496929972.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe145b3a51a---87656458774.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/midafematiredaxusuzavi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fubadito.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c82dabcbb6a3bea6d4b3b39d20d2d1ff/62240004089.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/13391063649.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610665bf7bb1c---55969732697.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086248e8cfa8---furaxasavonuwobexamelin.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03972d0581---robuvugoze.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbab5a696bb---7677228861.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/turik.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xibepoluseziw.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/11541417836.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093671e55bc7---82444624677.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10796 bytes
SHA-256: 92a03a6d810bfd04b0082acdadc7f6c3ea4e614b0df3747d38303f3f17bac38b
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 17312 bytes
SHA-256: 5b540c49b607c1a5ef10b9f71c77ace36d64d1892ca1cb04f49b7dbcfdef4b3c

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