Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71f64719e44c994…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 15:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d92760c39af5c54fdae45cfc699fed SHA-1: 28b1f81397f6ac32f50bdcb8dfd9c49a0b7b9d08 SHA-256: f71f64719e44c994b39b3e9bc8e16017741fbf36236abd4d2f0487c23b493aa1
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 links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3407494cc---puzobilemuduwelufan.pdf In PDF document text
    • https://dunaweb.co/bg_image/files/jigesuzowabaxokot.pdfIn PDF document text
    • https://invest.pl/userfiles/file/pexato.pdfIn PDF document text
    • http://adveotec.com/img/file/wapege.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2768dcfd1e---silasizabuzuletavokofepon.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/96772937716.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/lukopefirulune.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/98085977407.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3150c70b13ed035828fad655c3a7a7d3/28946858598.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/65ba8e11c9f88ad1bd45092a6b2ee96a/mipifoxuwuxuluvifi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628d5eee95---21782779184.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210526102033.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/fanakevodakulave.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a6eeb477---nizejogepugenut.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93f81535a---17275289898.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1cbff6615961c3f0e3e287d91042f8c1/peteni.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/23005976315.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/fesadekugesalim.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/k4p0eilh44g30a56nnjvoqco07/wopot.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eabaac37d88a032b827996a2663f253d/76514608020.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/21860010573.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19c92a63a---50989911481.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fanuriwuponovewupujo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/sokukevevawefisok.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/48865988179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=british+airways+magazine+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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11092 bytes
SHA-256: 3537d88ad4b04382265abfeb8dcde8b6d583de2048836120dd367db869b9db73
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 18728 bytes
SHA-256: d4d2d6b115966bdc4ac17351175976b977fc99d51861ebee67fb3443d19c95dc