Malicious PDF — malware analysis report

Static analysis result for SHA-256 098b3a72f226b67c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 21:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6f232dc1ad3b39e2a12fdf8084b315a SHA-1: 52578c6e7c2fe63898291b870685008f042490f9 SHA-256: 098b3a72f226b67ccb94ca2ea9d3812db465e6d3360fbafc3eaa0f7ca84939bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, and the PDF_URI heuristic confirms the presence of external links.

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://crysiq.ru/uplcv?utm_term=engine+misfire+catalytic+converter PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160729ec4450d6---diwuji.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0997717d---66204485203.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d252d2533a2cf123f0cc00125038f5d0/26952748329.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/24047003545.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/vudukuvikademuvuwugu.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/84943644468.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/rovuravojitazuk.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/nakaxe.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/toclqge49j20a4dmg2jbbd9i05/5070126217.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/29835760852.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/17505986727.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/pizoxebodemijipogelolun.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/fezunafiginorivokuvipor.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c0e59aec---66290466549.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/96e6f9035e25552428f26ccd4394e251/lepoma.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/13838288866.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780927090f2---76077678591.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/67609038107.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/94220300698.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/momuzupo.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ba35e4978172503d2869ef276c9a2061/defox.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/2880999806.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/piwifejizaledesikud.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 16096 bytes
SHA-256: 2e0c1af24e20c9940c1a3c2e7e7edce30ba27f2bc6122703d33df82151928022
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10844 bytes
SHA-256: a41e76bf9bf00d9d8332078eae945b28e536af41f2028c4a7630a11f54312d39
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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