Malicious PDF — malware analysis report

Static analysis result for SHA-256 1764cb383922be20…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 02:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe464ba09f02c06352b7095fc9ed2c5e SHA-1: 6baf7262ef33b6cb35fe96567df93fa3f3589491 SHA-256: 1764cb383922be2043701f820d272ab3bffc3ff6a4931d31fcef4a1c98d91267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=sgd+to+bdt+rate+today PDF link annotation
    • http://outspokenholland.com/userfiles/fckFile/20210612101442.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/35301673321.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/69650202290.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zusofi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0f2f36358---bamar.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tsheresio72mqs3nnqp4h2jjet/kosin.pdfIn PDF document text
    • http://foxadv.net/file/16400398008.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/safogafaf.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/7437217187.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gipexa.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/86835424058.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/rudakujanimu.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/balutefareruxaxev.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_3016941E41C40BFA.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/mefidorekonulakoxux.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/7410386344.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/13388428266.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac625781f---49255213435.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/44404144434.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d351eb5ac9---sofutibozale.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3eec25be0---jizulotenifogib.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/11726950521.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/nakib.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ga978skj538i58voovt8nftp2/50778892518.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/badevoliwalulopobukoj.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/35457195782.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_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 10344 bytes
SHA-256: a0a4645793f31d2b91d2a7f9469ac417f614160a044f5466a1a0aaf4c6fd2846
font_01_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 17400 bytes
SHA-256: 502b7d45e107a9995e4c5d37616d8eb8e8dc587f466018ade2881dc684a8c39b

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