Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a838f7c56951e4…

MALICIOUS

PDF

120.7 KB Created: 2021-08-13 15:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24b15ef7b1822f8fbd68ea734b3469f2 SHA-1: f980ed6e6c4e7a80be624752864c71684d6ca6a2 SHA-256: 84a838f7c56951e463d2f48f440d3f391e0e4b267cb5c68a4effc071365c31b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=what+rank+is+pengu PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2eba4331a---dibadosonowub.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/62418292854.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/metilik.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f95b791c30b5d04aaa0ab270116baa66/nabivenogir.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094defb4aa5d---89129031771.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/93916fa0d5aa057a580bc5420dd2c7f9/69434222398.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/99261121014.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd56a041c---mokemefolox.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3b657ac3af0de749e21bbc7cc6e7c2e3/45605952547.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/65ef5e42069f7af6b6f2e5509875eea8/31191709317.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/bixerubukam.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754172539da---595537857.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/difikakolapetubife.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/84ef0b69c47846f384dc523455213935/67304346883.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/tunapijaxunuxejisekadonoj.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946949769a6---tazetisonadigema.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a9d389343f99cf439d13a512f4f128dd/53112308697.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kodin.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/guvawafogifubus.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/5972529238.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ea766e01---takunijalokuxitikixad.pdfIn PDF document text
    • https://goodline.by/userfiles/file/76044636180.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4mu20nu1ih4df0sif9i24erp3u/60291093436.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_off000179ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AD 16324 bytes
SHA-256: 97f09ab613363659c091e5507f8bf2a2308decfe7e93f3bb3d15cc149f89a274
font_01_sfnt_off0001a3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E5 10548 bytes
SHA-256: 3caece8043211f2658579f84006ab177f72d52a940c1905334ea564855c89f7f
font_02_sfnt_off0001bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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