Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0a78ea8847f6a9…

MALICIOUS

PDF

98.6 KB Created: 2021-09-12 04:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d11e3cccce2f752c5b8f26d1be8c199 SHA-1: f9fc9e1493bfd235fe1b5a8dd7f7ba75990a8fc5 SHA-256: ef0a78ea8847f6a9e2e8ab921d24e6709bfb69337b8d16510dc3235172276c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and the nature of the URLs suggest it's used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baoholaodong24.com/userfiles/file/dumuxa.pdf In PDF document text
    • http://movitecnic.com/ressource/site-image/files/jerolotiputekeralap.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/21587848314.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22130963744.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/87267322110.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/43273955477.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/29812211135.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/81296360902.pdfIn PDF document text
    • https://alutat.com/data/file/30685136022.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/29078138632.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/67e1ea8049d22a4b3a7aa60339b5b6d2/83032913161.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/229614215.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/47776135989.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/lusokanususe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qtakoklbkaqqv44rujkpg3snp5/semulesulokivezeg.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ea1603814139a6c4c52761c94bc60826/19514185552.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vesopakazuleluranomumam.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/naxevurutivitoderetemo.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/gosajinanuxag.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/kalemozime.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a55a6e8b---75221937758.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/srq4l47o256s7q7pcp5ktlg7je/86250044390.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fodozuvivoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=48+laws+of+power+filetype+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/zifikidulilivitokeso.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_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 10776 bytes
SHA-256: d852e5541bf2685c8c3705e168b4b37688f83d9b9b0c53e2e3ff698a38236b4a
font_01_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D47 18308 bytes
SHA-256: df16bed1a24fea7e34c4f9aed7c6d0f2b488e11bd0d4e495fccfc6953da9db81

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