Malicious PDF — malware analysis report

Static analysis result for SHA-256 387e4f7465e9bfd5…

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 12:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da99575de575880fbca36c8193e3d540 SHA-1: 4279452708ce4285bf402711ed2e5b91be0b7ab9 SHA-256: 387e4f7465e9bfd575e4684f801e5a84c3b03d3fa3443f5e0b54e706cffdfed1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cb1ce313b9d2ffc0c419caf6797a15ad/zefadibizetavurefogoz.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b039fa761c5---zezowumizaluzefomima.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rijavibupivov.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/72546348534.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9407bd318---virarugexemaluvi.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/8444803924.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9a7b6d42a01642187b94b7236e45a611/38389569760.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/dusokufudo.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/537d157ef3d3bda233c02bff42499970/bemiwi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81645736723.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/42879103588.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5308954960.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/78abda293620ebc4dd210945972d389d/84691468917.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092041816e2f---98197245490.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6jilhu27b605kshoa1qr4nrif5/vuvarigokatudi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096715cf187c---11820737585.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b5a587af7f31909827690349a9e09fb3/48354149859.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52916301c---28647547675.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f812a39cc---gowag.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/94823658433.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/60b1353b58cf0b77166c235f37f369bf/36058321594.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/varojedigexinofujo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160767a273b020---19647201491.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d7d64342---dojalewala.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/18409086246.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f4u0dbn4ojp6ddnaqfb9nnro73/13079898694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=parks+and+rec+cast+ludgatePDF 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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 10524 bytes
SHA-256: 02e2939457b3ca5921947002bce062253e635a09bc79526057600370cdfce02f
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16944 bytes
SHA-256: 09790454d6a89cec5487f712a6cc1a403aca399c558d77f9e98d0dd07bcf1fd2
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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