Malicious PDF — malware analysis report

Static analysis result for SHA-256 c359b0cc09d3b5bb…

MALICIOUS

PDF

98.0 KB Created: 2021-07-31 03:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54c0c09a5b43a24b51d60c65e810d0e6 SHA-1: eaa99406c1e1325b9c492deb90e2a7d85c4cc514 SHA-256: c359b0cc09d3b5bb93f767f53691593b3c3f61968b07ba50e7affb78568c399e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs and link farm heuristics indicate that the document is designed to redirect users to compromised websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the detection name suggest it may leverage embedded JavaScript or other exploits to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=how+to+treat+esophageal+variceal+bleeding PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f179e6263c---patiwumomivemakuniw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d486b180de905247cbf72c072bb51ae3/zegonagiwowubomed.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/78c60ba9eaa08499a2313886460ad670/tinazejuvanixukew.pdfIn PDF document text
    • http://minhanh.com/files/39448971354.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/328f2d32dbb6bacd47534265a370646f/nejisawav.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/26567429019.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e9aebef6---31718702844.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/makamojo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec711a94b1---zuvakabosarajejubekisu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac724040f84---woxebopikogawuxo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/lezes.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c207c0e74---vokufozed.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7872e4e252---97091842496.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/13017455775.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zufizakomatosaso.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/57029982610.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072992897659---tuvijobafepolelalovomiwu.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16232618531019165871.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2420a5cbf2---44041561682.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/12253860841.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/xevonagovib.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bc12f1dfe2081aa7fe704e7222607f93/67491776059.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_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 18896 bytes
SHA-256: 09a0863118d41e8c5e7c45876678420fdf829e2460176769c7d584f8a27b5afc
font_01_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DE 11076 bytes
SHA-256: 5c2407e4ab947081fcbd660ff1328ca3d795df8fe0fcca76e3977929f6d0c28a

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