Malicious PDF — malware analysis report

Static analysis result for SHA-256 924ac656c7ad7f0b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 15:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ba47b9134972ec87ee6736f2c397a7d SHA-1: 511e13fb4c35a2cd26f0e37eef6c386cefad5322 SHA-256: 924ac656c7ad7f0ba4316887566b2e6a3d8fe61e17794a642307d5deeb0d0b01
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics further supports its malicious intent. While no scripts were extracted, the structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 https://irlanc.ru/uplcv?utm_term=minecraft+free+play+no+download+no+install PDF link annotation
    • http://pc-driver.ru/userfiles/files/54232143554.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jogixifof.pdfIn PDF document text
    • http://belovosushi.ru/files/59918784125.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xulasu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/71011764675acc7aca78b7b2dba74c62/nutukojakuxiwuwogoviga.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/63003064903.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/41363153888.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4c199abb43531d8c216b78afc134191b/dolumukizer.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/pexesibadegedudikogobono.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/75641697421.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/tililonubewosoxeponur.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/39034588058.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/lixerosemunesuwexifepi.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/56710672759.pdfIn PDF document text
    • http://domuran.pl/files/file/24435876409.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/63704554364.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23610904434.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/karojukezilinojuke.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66c81f36b---56346788293.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/80431856361.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/medik.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/viginipeb.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/nozilabasikazadux.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xosuberivewofa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bdc72342deadb4610b4571602e820472/jotatigibaborovuwi.pdfIn PDF document text
    • 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_off0000ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 15864 bytes
SHA-256: 0c02601888250ae8ff7bb93e1610c9192850c5ee8d281c8dce7c003c0b428f4e
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10808 bytes
SHA-256: 156b60719408d63f910023478fae13c171f96219dad3ecd8bc3e7e31a636fca3