Malicious PDF — malware analysis report

Static analysis result for SHA-256 7583f2d004094a9d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 08:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a984ca824a7a50493db439312b75ef1 SHA-1: a8527560e22c8958d633d45281b4768c504f48a2 SHA-256: 7583f2d004094a9d3bbec0cc207a5902d7f6ac5b1c5377e684ad2b67e2d6ac79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The embedded URLs suggest an attempt to disguise the malicious nature by using seemingly legitimate domains or job-related keywords in the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/puwazumazetekusavimaseg.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/aef919fbaf9fa8afbfaecac6137a7de8/71792945216.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/31405857308.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/50058643851.pdfIn PDF document text
    • http://teraval.cz/res/file/pigexawemegarim.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e273fcb3989b29ccdaff2143e8ceb187/vajaxabojeg.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/kagox.pdfIn PDF document text
    • http://saint-party.com/media/file/88870627680.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad076734e---jijanosafagemox.pdfIn PDF document text
    • http://reflita.lt/uploads/files/26667968675.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/69222656176.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae7f5ba81---bogexu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/85300195730.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nakojagudakunefaviniwe.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/45020293818.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabogimexifivopemexape.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/98923731302.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xeminanozov.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/jiberuvigiruvaku.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9099228b7---63304932534.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161141eceef66c---gabujagufogodaw.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/97547336260.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92f220b1b---nutuvunojogakorimisip.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/44571895135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=customer+service+officer+job+description+pdfPDF 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 11040 bytes
SHA-256: 4916cb220fc28e581f08fcfaf48703a37979ec30b8a79319fd94ece7ae2487cf
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17112 bytes
SHA-256: 03a085698e658fa13dbf8c9c00ce30130758d11726849addfced9d115982504a
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1