Malicious PDF — malware analysis report

Static analysis result for SHA-256 390405dee83f6c04…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 11:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0236575d8fce3c33cb3781a56534d6e7 SHA-1: a317264ea648540b8d67f5d0c8ea92cb8f13750d SHA-256: 390405dee83f6c0431e54af714bd3b66cfcc98d44a8d10f67a683aa5750fc142
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into downloading a password-protected file, likely to conceal a malicious payload. The numerous embedded URLs pointing to various domains, including compromised CMS uploads and disposable hosting, form a link farm intended to distribute the payload or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=juntar+documentos+pdf+en+uno+solo PDF link annotation
    • https://zionapostolicministries.org/uploads/file/xabozi.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/fajujola.pdfIn PDF document text
    • http://fedoro.ru/upload/file/78682473485.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c606f769---lituzarugazadupazogave.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062612031373499.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/fojojebora.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • http://teraval.cz/res/file/23791737563.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b149b57e120489d0fa356b24cd9b870/89883442650.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c21b4ed4---95733053677.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/6922429901.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a6689ae5---sulugitolisokekifoviraso.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d00fd0d7f9779edac9bce4918c0dde01/21613217785.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/xapevevuwoditebeni.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/nunilijunosu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b5ec372cee2071cb4f1891b0122f8953/wiveranulosedub.pdfIn PDF document text
    • http://laduses.nl/image/file/24684700534.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca6f2f2b25084731a42c452c1200d613/digesejiletibi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cef7260cc---45022484507.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/gunofefokumenekojilom.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/47083734407.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/48991675227.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/84784501778.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/betawokilut.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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 10780 bytes
SHA-256: 7fd975acca8e588178048bb29297620babe8c524811468640a291cddff3406ef
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 18716 bytes
SHA-256: 0856f077cd7e4b50cede5df881562b8853df427e4dedc9bf24bf1d0ef1e2c579

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