Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65ec470609c1c90…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a4358a662eaaae233e94351a890f8e1 SHA-1: eb36ee155058335de0ed22d8b8b6df82f9de7256 SHA-256: e65ec470609c1c90eb5e0aa96e88f922978a5844719c5258ff9abadfa35c7504
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These elements suggest the PDF is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=emojis+on+android+instagram PDF link annotation
    • https://jnvhardoi.org/ckfinder/userfiles/files/83662938516.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/65213091046.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/savif.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/jenisa.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zukizatonuk.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/zopabijufojifidifa.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/tpio804svrk78rkr5l6nv3i4p3/69364961089.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed6a570d---pefumawavor.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lbnij33hbhnfep3tangt9hta96/4487137325.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/22630803701.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zewofugukutisizujakin.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/61843115071.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jukib.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/76670664156.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614074d09bd76---94112463841.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/voxoxilimafafuzapirek.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/13709282072.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cee4cc89a5---kelemamugazalogonotume.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lobin.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/tumomejeniwukaxasuwovu.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/79405258456.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109162219167342.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_off0000b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB697 17156 bytes
SHA-256: 9662f6bb94081ec9b6d973d06047136f9d601911a895d55558d83aec5ef680f0
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10528 bytes
SHA-256: 60e78b4b26c42d3c1aac6b6781c132d9f504b1f5516d1993e0afc754b6fe3b60

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