Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b47d6bfbeee24a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 03:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85486f0784dadb9d6a370b08ef220451 SHA-1: 06e003aaff4cc219602f660dca8d60fdaf71ef2e SHA-256: 89b47d6bfbeee24ad94ded32fdd5d3beae2921eec3bd0c1ee3f73a1bbec44219
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alexanderkanevskyartgallery.com/clientMedia/file/tufogojopufozulije.pdf In PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/82400592240.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/jidefixezepever.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/56256084479.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/varafatizodubebokatizor.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/18885065219.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a308ddd6c0---duseliki.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee87af939---53776458726.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44cdb001---javopugugilivubofuxafow.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m2vebigu0lr3hlu4uq2u7e0sue/38345226587.pdfIn PDF document text
    • http://khocabien.com/uploads/files/ditesonavaz.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fmds40665id8n2jl1kr9p7d9b7/rodedugizematelabeput.pdfIn PDF document text
    • https://agermag.ro/mm/file/kelobamiko.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1b823cc0---bivagul.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/roxubeviwaxogunosabujumad.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/95645935722.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gopozibumivefubip.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/jajebudi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b95e8b9e4e5---86654243986.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/49vl56nrs37amumi8av7p3df72/falodadufig.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/gujebuvoda.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/bonisedigemabedasub.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/webinavilepen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=excitable+tissues+physiology+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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 17640 bytes
SHA-256: 850b7a40f8317df9698c64ecb9615e6da242b23be2c66ab4d7816072c1aefe97
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 11136 bytes
SHA-256: 4bc85b1e8d977593ec6d8d678f7ec6f84d5f8571b4cabe1e19e58f2381281cd9
font_02_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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