Malicious PDF — malware analysis report

Static analysis result for SHA-256 339f609dad2a3879…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 22:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffa8bcbcc6ebb43b1245b69401484479 SHA-1: b61126a473884cf32f3400a041aa8eed19a28e4f SHA-256: 339f609dad2a3879b6b5855b0750053a1b8132e7aed96573d2451bf7d59f9834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://garglob.ru/uplcv?utm_term=one+day+dry+cleaners+near+me PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf45f2917---mipiz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/468a29870a991596e10d43896c2f9fec/xogogekasukusikunanawevad.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/55002456137.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/71554490006.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/32328622536.pdfIn PDF document text
    • http://xycrusher.com/d/files/40138394024.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24652672372.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7dd07deca5a869d578a462e42da1268d/79160386792.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/73220577430.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d4e0c758d058bb78775fd58c50f54b7f/mukosevizelikaralipoteb.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd16e5e7952---towetiwupa.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210617_E9F16BF65C6FE333.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ddc21bc22aeab0d9c632418cbddf3305/51267526297.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf6b78f82---rufutebapapitiralut.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/4424377579.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/37523274097.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kijovago.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba7fd850c---somoguta.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/jiwiwilerozesatebopugeto.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/sorowotebadapokovoxi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5928dd8d33---mexuxevinakevunef.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40998655698.pdfIn PDF document text
    • 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10360 bytes
SHA-256: c8b92f74f47df06be6049be873831aa0a2bdb10cca6276c13b069194a545b620
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 18440 bytes
SHA-256: 9e2aca1e0506b729a4cdec134a5e3893b420b6107ee3e25eb10a76919828d271
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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