Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec3fe27c558b968…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71a03ea59e90a868d5fe8c8c7ec2f356 SHA-1: 4135521e862df07127eb0fc4aebf9fc1a68dfa0f SHA-256: 8ec3fe27c558b968665557b67d5fa2edf13d3ffd144f1a1dd6ef155b100112cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or downloads, aiming to trick users into visiting compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2fb1e106---13145045790.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/14c00a437c4568b1911ade62fd77ac75/gixubanuvoleg.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/ravakadulomamuxugusafo.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kuvorudesa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c196f2abe3---70297653621.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/36670472558.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/h4v87579hamj8883k3h3cpfml5/24724761117.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ed482295706bfdc536c781898084908/89246401272.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pebaseravobaluj.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/widiwunoroxegitimejododob.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc14ae033---zurezeduluje.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xewogadir.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/95eadb2f6fda8866a8623115ae509f8f/vofuropofojirafezufit.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/46307104515.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fomoxopanebapagofisiliki.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vukiwawezoropevidit.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe2b6eb0a2---nebulubugapi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/69645241089.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/22030058506.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mdc3choo60khagr4ljog5uvefs/81579212795.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/t14p0dg540ueu4cdbk8ckoksvd/gowavitupos.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/55858308007.pdfIn PDF document text
    • https://trexanh.net/upload/files/wolekuwajodivavafixepuva.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999ddfe1b4a---zafele.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7ae8e6e20da0e89876791bacb17ccb46/91001358456.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/18108669119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=trigonometric+derivatives+table+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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 11132 bytes
SHA-256: 414e1a1a62d31ac669e08ae364f27934ecdcf7271bde63f2d6c5d08b71697b5b
font_01_sfnt_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16172 bytes
SHA-256: d526cb4fb8aab6b5b87377a4a422c7ac84ee59eb5e96a707e6e5316fcaa44d91