Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fee258389d1edf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b7a71ed1a365c9ef43a352fa52557c7 SHA-1: c3de554106eadbf7b019ca7d9187376650cef3dd SHA-256: 90fee258389d1edfc16a6b009dfc5c166b0aa6d640276d1621de8e420678821d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://natyabio.com/uploadfiles/dufebujaris.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/95694302739.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/84056548016.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/8957980781.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28cf979f4a---gofagix.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dekesovuzo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/90825040532.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/10282568642.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/76082969821.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/305534474.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/jaxaxut.pdfIn PDF document text
    • https://bioesteticaonline.it/file/sifezoronatiwiloxeval.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125341aefd2a---vixejom.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sejimuferuxasipedanoxufe.pdfIn PDF document text
    • http://sparkpro.lv/content/file/geviginosefeten.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/63139308872.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c36f5crc3e3ever6cneqh3ai67/dopinero.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0b47fc48---zakodupubariziv.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/zidekumovozuwo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c562bf3ddd4---ludenodolezuvelemu.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210731004224.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/88fc7e213edf8bd2c87278335936a08e/zamisufuvodejiwofuxudip.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1a8bdb408dd98d0972ffa314edbe1615/23534733239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=domain+driven+design+book+eric+evans+pdfPDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 18136 bytes
SHA-256: bf6f6901f5e27fdbc937dd8e9f3c66b3f763658e8799e371795972c692e2f5fa
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 11116 bytes
SHA-256: 544d6a44465bdc96b6de1d8b88e60b98af0c305f1b9fdb3c5757ed6980454421

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