Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1614000c9f8601…

MALICIOUS

PDF

89.2 KB Created: 2021-08-08 13:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a8543dbb99ad5a210b56ed8e5fbb25e SHA-1: 43ce47d1dc850968acc5ba883af1a08eb83e3eec SHA-256: 0c1614000c9f86012b50ad8f1192d385ab0b462a2a008e11efdf957b62dd1cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule indicate a strong intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://axwelindia.com/uploads/zosowekoxesabupebogu.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ess9njrs39c8jdafnoahmalrk7/sigekibunarowe.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/faredawubejuba.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/81346211805.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/kidamakevuxepureduvi.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/74855550633.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80dca204f---71989996656.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/48314475177.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/53542da1d393bfebd56a86317217fe64/41157608815.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608051a27907c---nujimilezupadixuwod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e336091613aa833742c9c7c314954ab5/73578730227.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/g1vg4j3utu8pue5j7b01ehk8u3/mubesegimijufezusumejepur.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wemafidodaxojole.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087c936e9385---kufozovuwaxev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a6d5eaae8864d860920fc7e587463630/gijanosajumesita.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/fimasetugudilosufod.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/todovekun.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/89560365721.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/dafarulezevoxatekosikubon.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/98301540596.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106260823377125.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mudulilekig.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/42447044167.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/71a9eb583535022b2eb03fb5d51a3b00/tifozal.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b51d2a47830bc6f7f14f4cbea9230425/gusore.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610124659d687---ravejemeni.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/654ep8kv90jgs8hpr09lj3srch/rosalurizisodaxodasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pewdiepie+tuber+simulator+mod+apk+2021PDF 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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 11160 bytes
SHA-256: 7ba452614170249bfdf184e1f7a11ff89d96b17d6cbec99197bfcaa6e169dfc6
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 17120 bytes
SHA-256: 4779d6ade70ecc86337266e26929cfc1b93f17b85e6d1ed15bba7f3adf72e4ca

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