Malicious PDF — malware analysis report

Static analysis result for SHA-256 c586350bf94a07ad…

MALICIOUS

PDF

116.4 KB Created: 2021-09-07 19:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78f3fdf2e0df04ab5291384de3f2f3e6 SHA-1: 0f9ace77da9eb3852d5e55966c8933bc37394599 SHA-256: c586350bf94a07ad46385e9dd42c49a427f94b9cb8ffc86fc88450f401c5d328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=sabarimala+issue+supreme+court+judgement+pdf PDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160818cd110606---majinonusalibipujo.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/92015034016.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vonunatazagog.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/futejudedokanapowaviwa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6500c44ee---96387223269.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/67780760727.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/36360229385.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dcebea027---furabigubapezipovunepeta.pdfIn PDF document text
    • https://poker-fire.de/file/38077940924.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/95549518465.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babb94b06de---44441294036.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xulafubowoxanipe.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/28f51afdc7135877770296e79fee1597/7057354941.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e42184101ef13769a717576d7f5701c7/42497919826.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ebd8065741443ea72b26c3f2bfb0b13/98380741581.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wabiledaxifa.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/84968804494.pdfIn PDF document text
    • https://angkalaris.com/contents//files/85072931278.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6679a3b3---62429738728.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160828add58a3e---18186597588.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078f56d9670a---80301391177.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/71111251544.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/07r2q5umurg481obtn676c8ldb/76869828802.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_off00015ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA4 11408 bytes
SHA-256: 52940ec7d0360a0cba4c325166fed8f53098b4097700b5ef49a96638710a39bb
font_01_sfnt_off00017705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17705 20652 bytes
SHA-256: 30d997e540522acef41d0797ef314fc0c112f36810c1a6cc430bdacdad17f128
font_02_sfnt_off0001ab32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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