Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ad08bd514ac54a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 15:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57a2524bdf907d4b224848e8c433b909 SHA-1: 3f0189db906b1dec3cc52c41e5abb82d8893d399 SHA-256: 67ad08bd514ac54abd3a778a23aecc6ccabf6a77acd429173b503bbf4ccafea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites. The link farm on compromised CMS uploads indicates a technique to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf917a243---povuzadetine.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fea4809d---bosukeritinekex.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/76597346309.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6cd13e0b---serupazorososutibud.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/dutiwewasez.pdfIn PDF document text
    • http://teakdeck.pl/files/file/54963641162.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a7f772ab1f498a62854b4fc76fc3c0/18653107099.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vixuvutikovidafoxe.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lujufuxerit.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xukupefeju.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gamubomopowefa.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/fofomaborerasetavexu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84f4ae6e45---57650263551.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/64775031949.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6d7b8a702---53649675825.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/400c020ca51150c8861563c376fcd09c/2972396277.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gokuvonumix.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d76e2e3558174a9d6f2e8521fcb87668/remapokajineko.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jijuxefuxafixureromu.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/dazavejevalirun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ab883649---48330798094.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/37625410953.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/85992234539.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ab48e41b---xevekadivilokofoninejomu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1kpn9puk0mcgq4i8jv2rt4iak6/jijezeloduguna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fifa+football+rules+pdf+2019PDF 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_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 11068 bytes
SHA-256: f0e1d95df1753466d9db9185d7ae8d26b2309a8d6663d5ad33923c147e09d87c
font_01_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 17756 bytes
SHA-256: 77b51f917c884f40fe3e52dd7fee4c3037a7ae6a1164a6b174444ddc30cf0b1b
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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