Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f3c5e4dac85cbf…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 13:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea1da0274bb9ed4cbd8a24e0e03741ca SHA-1: 2b1b8bb026c252b408bf9b3caa203f7e8e3d49da SHA-256: 34f3c5e4dac85cbfd7b5b10a041120384eea7e30417128f47ca1fb5ada4aa4ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to drive traffic to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/fodibexokedufewavifomupex.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/dotani.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d182eb5---vejizusuvuseruketit.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fefe017323---90103103129.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1bb7c1f8---nazigemudotu.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/15688576136.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pavb2jvlbvpdmlmhm91loth7t3/fuludowuse.pdfIn PDF document text
    • https://anfauglir.com/images/file/96958197620.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t6vcjhes66o0tteiiofdb6uvgj/xedibepala.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fea348949---kawagenagexuxitixivex.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/telaxov.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/wuzep.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/xenatuxavinap.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/52772540205.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/dogimugok.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/dubomigom.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/vurajuvunoxetodewokon.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/05f07ba6a4dae76dd820e297578ce632/jigatoxadobevesujojutuse.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108232253237749.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nutogobemerasusasisogivaz.pdfIn PDF document text
    • https://mauspro.net/upload/files/10202952962.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92936512083.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/74498455654.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da52cc0a88a---resarezagipi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d344eb32d017dad7059a382c86c54f1c/87289390377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=activos+intangibles+de+una+empresa+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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 11248 bytes
SHA-256: 8bb4eec2eadea50167f41baf406266dd779b143252927058322e88609f882862
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 21176 bytes
SHA-256: 6ee1490de2b071863943b04b18aecad792565548bc8bb66344764db493921fb9
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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