Malicious PDF — malware analysis report

Static analysis result for SHA-256 05938ba20a9f526f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd452e47672d7f68ce2f9f4f59ffc163 SHA-1: 5fa6321775887c7177fe448ab5297d1d0c99c0ad SHA-256: 05938ba20a9f526f068f583bbc06e10e1fd2b17d57024356cf98c1b3ffcc1cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm designed to obscure the true destination. No scripts were extracted, but the overall structure and URL findings point to a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=emulator+on+tv PDF link annotation
    • https://netcsemege.hu/ckfinder/userfiles/files/pafokewu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396d2f1c8fa---1135436773.pdfIn PDF document text
    • http://eichler-kammerer.de/nazarimenidojunaka.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/89078523546.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/37577425878.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/42673889701.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/29469877883.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/53646496173.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jakufarixugibasodade.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf71addc5---teporiwet.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/18457941988.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/pomurodenepo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/43689759190.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/dakebujefu.pdfIn PDF document text
    • http://villkasz.hu/editor_up/47635017994.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/6217455746144ba5b04f7b.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614455c1e2869---19680708125.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/mulabesoralulitilopapu.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/rokaw.pdfIn PDF document text
    • http://livestocktool.com/d/files/japodutegovarizake.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wanor.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/72439764344.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/44501303691.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/38efd2c2816d6ad0b787464ed4250a3c/72026720453.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614287d5a7553---74489945988.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/dikegusosix.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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 18672 bytes
SHA-256: f033689491fd37b4278646f392066c6a7058f39c75c1c0a85bb8e80f7279aa1d
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 10028 bytes
SHA-256: 2043dace53a1da93bb673908b75dc72d22c4bc7eb7446c6040b35414fc762926

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