Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ae2dc68d8ca3e3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 13:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20f170fe5cc9b39d38f51015525e2209 SHA-1: 2a16231bbb8d7e1c90901d7b8fc9c175483d9780 SHA-256: 33ae2dc68d8ca3e310fdd07c7d655de8ebf093d9640f5da43f9e74f39b536937
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The 'Image-only document with action trigger' heuristic suggests it's designed as a lure, likely to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=uninstall+adb+drivers+windows+10 PDF link annotation
    • http://nguoiquangphianam.com/uploads/files/tosuzakup.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/rikafafasaz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dsj1hgalj2eq4pkub612ou4n8n/giwugeg.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150a64e2ccef---35040357533.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/83745115753.pdfIn PDF document text
    • http://dd-eng.com/files/files/75022482674.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/wujidawosuxajapagomamad.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/64436108454.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/5239223938.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/luvepivivizagufigasuvit.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbba901af5---koxupu.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/lojupagifomovi.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/55572580346.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/4698039007.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/38069276527.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16150e17cd174a---meberazawilikaz.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/sitegoputovukibosiz.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/patiforetadinofakujoxija.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/nukevuwuziboxu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c292308---85222411943.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/sanuxupipipamavud.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/68239300411.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/lfgg91319n3ak8aijolu6v9q4u/nuputuxejasu.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/93908541837.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/buximuf.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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 14388 bytes
SHA-256: 67a4232ab652f6cd31ce4a31242b0d7827c0b90a62b4998c281c06c3135da410
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 10716 bytes
SHA-256: 8a043c0e6fbafe9426510b186284360a144be4a6a99372332eff3555601c139a
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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