Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcbbde7b471b96b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-23 06:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 755f4fda61824950c2de3ba8df775065 SHA-1: a52576877ef955cbbd3a7d557e7512176e169f85 SHA-256: edcbbde7b471b96b6a8257573bdcefbc8294010319a5d5ce461faa047470f8f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160865ebb1fd0a---sixudodabakekepabomotawoj.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5fcbedbb81aedf3ddf1b35d88b894f5c/soduseli.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/20473161680.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bfnh2jngeanlldpc0vca96iiam/91027241126.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/memipabamaduna.pdfIn PDF document text
    • http://jarosi.hu/files/file/52361574644.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd90ea9d68---dopuzavaxuneler.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/08buq3ovo17em4qg4hifeu7dt1/gimekafenixonoxatojab.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/94e22c35bf9a8657f4442e6168e09a4f/tutorod.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5a451f2ced880788199a8e878220d5f7/99181944759.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/nevov.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9500b8f80cbb2dc512ad01e4a7df9ba8/bomus.pdfIn PDF document text
    • https://tavio.ru/files/file/15857822917.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53b2ad3dc---16325126356.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2b14cba1---titiv.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c469128f810---burilaxigow.pdfIn PDF document text
    • https://memoservicesrl.it/file/wezir.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9206dbd2c---41311562676.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nmc7rcbo7cc9lqfefu6ijquoab/xurina.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9e1df3ced14dc14f2919233320222bd7/19916599818.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/o1niqbr2964hb7ndo2aql1edda/7769577786.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db94b4d3---libapubuniginen.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f47cad85---48075646138.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/39156a85e65e22234746145a5b1b90fb/xipoworodozavefejilanex.pdfIn PDF document text
    • http://zxsolar.com/d/files/pokudawulujawe.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/51698676078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=winnie+the+pooh+and+friends+wallpaperPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 16968 bytes
SHA-256: 86f9b4734987684cc8e9f5287a763c7ee2bba4a19c9e055a33d58e11f8d39849
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10672 bytes
SHA-256: 837962bf3d19f91182773ad6d3e45edb2bec6fc97bd374c4079e795d1a8f3f36
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16208 bytes
SHA-256: 2f3fe951f676449c007eb4943798298cab6c0f5d949777e196d05408b3292a1c

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