Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f93006fdc9ce070…

MALICIOUS

PDF

84.7 KB Created: 2021-07-15 17:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5cd00543f1a41a7895fd9b278b6ecf0 SHA-1: 114ae1892b510387b2fd86c584962c482cb40d67 SHA-256: 3f93006fdc9ce070cd52ffffb0d26616dce404540127096ef3e141a90c485ad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further payloads. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive invoice or payment request to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://greenbrier101.com/userimages/95150517090.pdf In PDF document text
    • http://meyanko.com/userfiles/file///waridakenamik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/783180cc7b80a3bbf8306b01251fb853/29681156974.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1071cb5fd4772c8829fd88cebb189229/tuselixebinutavokitu.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/59218739688.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/22216440973.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf430a371---fabadefeziz.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/merumogevipev.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0a5bd5bd---17165887764.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/rb6216fhat8dda1pek0nndcc7h/79610877815.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e8808549dc0---38215565495.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8fc11275ca94cdc73ab32cf5a8977960/bosobunasajefunudu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/numamizewatowibufipasipux.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d10b66a0e---lukim.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/jumapovotisubit.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608235a1a4747---88278966095.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/civgtue8pdtqh7ca5a8d5a2s00/80030031614.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700d55121---94711463130.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/46479485178.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1a4a6ec1b682e3266e77ef521eaaa549/85762927097.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/40143865062.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/00ac6e4633270357df45ca3de3dfbc56/kefigenizisuj.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/gedofoxoga.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/1124906eaea6afe82980ab8b06af541f.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/nujozarifid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=where+is+area+code+505+coming+fromPDF 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16888 bytes
SHA-256: c0dd9b041fe9293d381b687513bbf5e5e1f5cb28f0ad810d03dc86dae073fc7f
font_02_sfnt_off00012c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 11028 bytes
SHA-256: 122fa1876364ec8c95ef62fe99fc6ab6d627c0df59418cdb3cc518099e032e3d

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