Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5e5c631dd78f44…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 06:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c576cced665dd0cffae00beeb49333d8 SHA-1: d17bd8a18873493602504715478cd0997008da01 SHA-256: 4e5e5c631dd78f4481c99ba0ba9a463b40ad41f52c0bd4c6dc2801cd0a56fdac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • 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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/351c888df3a841022330c8dbebe7bd9a/33675307048.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/porojojuso.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/mivibiwokufozil.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/gamesewoboburopovanoj.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/sazuzejoluvegulisas.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bc5f98cug6rdes5f5vlopf28u5/94992819967.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e64418fad65daedcdbb3d7b505ff1ab7/berulafid.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/15175586266.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/nalelefeg.pdfIn PDF document text
    • https://arerp.kr/data/file///72810813063.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/92552381691.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3c1cf59c6ef377d75db2fe11d6acc8e0/furojiditedi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/7288094997.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/74405247564.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/xarafu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/jupixu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ec7904cd---pimibog.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/nujejojabe.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/torojuxukiditeteralepeko.pdfIn PDF document text
    • http://metallpress.ru/files/fenabekal.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255a4dca9dc---fivifazudomabu.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/46119780922.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4ddfcb53ead3ef5da0a4488ff5c684d3/14123321240.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082441b4143a---pazilomubasarovazuf.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jexurelul.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9fc59cf651e18f8f6d7f9ac0c1fec43c/turibakume.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/wawimub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=conversaciones+con+dios+volumen+2+pdfPDF link annotation
    • 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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 11000 bytes
SHA-256: 07aa0896f43f1fb5e37b19e9e859300c022210ed3807b408d53ce12acbb11655
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 19244 bytes
SHA-256: e286db32747b32e03239a250a9885c2bc49c1fcddc8362014984388006ae19fc
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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