Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f44c63e4b45889…

MALICIOUS

PDF

78.0 KB Created: 2021-10-11 13:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 480358f3086fb96f674f4a48b6efbf78 SHA-1: 94bd2f2947738c55b1bb75aaf84aefa5d13757e8 SHA-256: 10f44c63e4b458891c54e637d274192d629525ec1df1c1fad5e31c2c0e0e1ac7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking links, which is further supported by the presence of numerous embedded URLs. While no scripts were directly extracted, the PDF structure and embedded links point towards a phishing or credential harvesting attempt, likely leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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://labellebeaute.com.hk/ckfinder/userfiles/files/sipebaxoz.pdf In PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/20356341053.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/9252353978.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab099a793---79880156228.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gudetotuzatofutigapilej.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158f0466f86a---nepenojewelunogogafoditis.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/62448912019.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/56215523476.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/36753366834.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/31712397590.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/xuwejatifo.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/57463766702.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/folejur.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/muvexamajigobosa.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64007284767.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/25bbd474b4e3238b2868af95e48d472c/59731878368.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/33446800211.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zexijisafufajewimufe.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/49040046151.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/30297712054.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f245f6d09b866549c50521e2d649b614/wenefo.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/bezopi.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/mipigoriga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=tax+refund+places+near+mePDF 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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 18316 bytes
SHA-256: 40bee3e8cd8256cf79d8fc305f710700b90dfd50667293f6a2f36fac43ec1094
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10636 bytes
SHA-256: c7228a923ffcf7366518a39e4c1a1f34105159061d585c832005de48cbfa8764
font_02_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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