Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b66e7ea60524968…

MALICIOUS

PDF

89.0 KB Created: 2021-09-23 06:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59024d22a3adee3595a4afc06940353b SHA-1: fd79197cc32c44592c00a3ef7420bf7f7f0c193c SHA-256: 8b66e7ea60524968d6c4108776883557f98641f4daf775aa7ac9823eda2602d3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gbfrjournal.org/pds/userfiles/files/poterinavodaxuwukudu.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334fc46a1aa---xotiditawumijalabuxat.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vojora.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/litev.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/97819509776.pdfIn PDF document text
    • http://japhina.com/upload/file/peferegukuwupoz.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/33064686965.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nopasovol.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/tozexipamulofenab.pdfIn PDF document text
    • http://bamor.org/userfiles/file/47281284775.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/45058237925.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/wubobetomafexoripofusewar.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/52244477032.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/mosufulanoruko.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/84235108812.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/43243412088.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/bojedefupene.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329876def6f---16135601890.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/bekos.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawetavevagumojufu.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/jimagusevixevininumite.pdfIn PDF document text
    • http://timocomputer.cz/files/file/kuvujukazaduz.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ee6f4656a3ba5bfc24992d29c6559d3c/manakamesegeveb.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210909_AD2C58415C0D5D67.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dd11998745307f7813ada1aad6577a87/jubonejogarefamen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tab+s7+tips+and+tricksPDF 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_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10452 bytes
SHA-256: 47acd9741421ce011da7db932ef65097409babd4684fc5f9a3de335e1f8c0dfd
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 18904 bytes
SHA-256: 61c5c0d10e76b0dd13a97869ed799f323d7a95863fb2aadad58b320d47f0dcd6

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