Malicious PDF — malware analysis report

Static analysis result for SHA-256 005043ce89113a84…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 06:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 581eec9732b8f6f9b473875bde5f96cb SHA-1: a5dbf542f2f191a3e91708293531d63c2b2e36bb SHA-256: 005043ce89113a84098d0439eea93b1463c1b70df3dc0be5dbcf643bf2fe9499
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggests the PDF is designed to exploit vulnerabilities or lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a campaign to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb2314cc7f278f44fe0e9de6f94d0c0/pufutefixeva.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fc79fef3190a14d51e674fa4dd5254f2/91838709084.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0536cb36c7---69109385158.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/zunagozevixetibokisez.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/pirivakagisesas.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kewepebedaxiligek.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/visinavo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/meguterop.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/79683552348.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/bodagusubabutoselisovu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/pju2psil9p6n5vq8vieprt7u64/tuzogazemol.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1b4d6ea7---55517857064.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ae30d12c3---6287059281.pdfIn PDF document text
    • https://mackbeks.com/files/file/7962753860.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jepojuvijekofa.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xazipidadipawutekuwurovaj.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pn5i0b20ovjasgjq93amjbr3u3/45483280042.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/wobowezuma.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/m71ngf6ohhs5da7haqn3qs0ulg/melofowunevep.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea975f3c01---25013834179.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/37870388298.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0debc5a---febakokixalowoponab.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc0965bfc---59437578512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=calculating+area+and+perimeter+of+triangles+worksheetsPDF 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_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 11376 bytes
SHA-256: 9108972c2b4ac6065753967b77a2807fdb51272ee4772fea8945659c81ce2b21
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17972 bytes
SHA-256: 1bc2f90f83396d60ba1d003c42055a0e0c3c5f8c628e5ab2892260b5607d11bd
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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