Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b036c96d0895f4a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2151675c7017f313d6d6c7ab69f18df0 SHA-1: 99a339d0e9e943a9e4ba0809c9e17e2f22599827 SHA-256: 2b036c96d0895f4a98adc533459dd3d416b3a5fd9f0bb74f48884b0d0a3edd15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=dsm+iv+tr+pdf+download PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085049ba3713---1260114748.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/jinomageroguligiruki.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bapili.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b25cd486204c3c65805818db49e3983b/lujuzelaxirikigunir.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/97274367057.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/29113715956.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gbajihpovcf98h44v0knq2i69d/20386514479.pdfIn PDF document text
    • http://htcable.cn/d/files/zudefusoxajidimu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jakavosuxe.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/57065403176.pdfIn PDF document text
    • http://18554080.com/userfiles/file/98071270728.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb78e3a9be---94994973504.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/53517360397.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c26ebe45804d85d63c6cd49edeec8595/60261014141.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9424c499---59941367086.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f21155ce---21609989487.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/wulufoweji.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/906399319.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/sexunujexixeboperik.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/gakaxesujopikipoluzel.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f327f5d1aa990143879bc9c186ca91a6/23193315429.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zupumuj.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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10680 bytes
SHA-256: 84fcfafb4369299dc2bda106a95e9097b0ce6664ab240a491448fc11f4df35a9
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 17620 bytes
SHA-256: ddff2f6659e6c754c96f44579958f916f1327dbffa9fc5b98d8901b7e1590cce

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