Malicious PDF — malware analysis report

Static analysis result for SHA-256 0398eee4d4531bdd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bf37f45c7fab016da615f63b2c9f178 SHA-1: f07d8ab0655b79ea26645b2086c4a746dd3adc8f SHA-256: 0398eee4d4531bddf7f07c1847b9b829ed7eed9b319c8f730b2f1e87ee67323c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with multiple URLs pointing to websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to leverage SEO for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://josquin-capella.de/download/39487464813.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf731ed3f---fakemonagakiza.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/99057204609.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de26681a081---besekixilonapuze.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f74811c4f---39631845353.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/14d011b355b5a9b5ddf2b99a3c767667/senadamujujomuropeketa.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xenopagadozironibabadowuk.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4d2e5793c4a0baf08a619b295d4fa0c9/sopazijurofewakeb.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f092a600---medewexepafizelurazo.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/tevizin.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21962445648.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/42061398092.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/50258916456.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/koviroxozimo.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/49647498582.pdfIn PDF document text
    • http://cke.hk/userfiles/sineli.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/75629694606.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/afe59370960f4d33ffab164a0d8bd7e6/32231296631.pdfIn PDF document text
    • https://tepihtrava.rs//files/10446293260.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d02b78b44---85081862838.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/19102698595.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/81142570114.pdfIn PDF document text
    • https://cartolmania.it/file/53504424518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+a+wool+rug+be+washedPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10696 bytes
SHA-256: 1f62d80150711cfbabe9af0f1b643c2519f560a9f14cc6a7c0ed7dd06066f4ee
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 17592 bytes
SHA-256: 580b2f4a2a88d1d3dfea270583183e13d212bec9d1d13d590f6d6093923bc6b4

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