Malicious PDF — malware analysis report

Static analysis result for SHA-256 33920987389a5a74…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 17:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31366eb839626deea1c1c5c3b23cad9f SHA-1: 5fb0899accbf091d2fc84b4299ea14790cbe7373 SHA-256: 33920987389a5a74b1819246e61fa0c5ef027b9170753927dd8b844275fe936d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c07c84aee4c7b2c7c8041d49ad311cd0/76752861920.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b59c703a9cd88e82b719964330669e0f/75403262020.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0jqpg46ebcfvqecftsg1v2aik8/wuketujowiribavinijir.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/jimlvpnp5tbndl23ug044h85ru/bodafunosevidoliguzixum.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d29774055956be5fba2e5dbeda476898/petivugana.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kijosim.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31c634221---gotizer.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/rivolokujinazejik.pdfIn PDF document text
    • http://sun-tes.ru/files/file/8009604978.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/tibikiwewokotamopiluxisav.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/10948290191.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/1273913235.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbef3c61d29---xibim.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1376cd8b1f64e42462e027ac9dbf9ad1/mirirajadu.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/96769148797.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/lafademepatowaxom.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v83a7rbjg99lrcbm1p8b6u09q1/64119203262.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/patopifugekebiwe.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/saratesijereravopuk.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/gikunokofatigesan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73addf1e---31720383970.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d574430dcc57a093d57a70fc71cafcd8/49518637393.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pasapasozizisexuvapiv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc66b38af5---pefokizizatawibafo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf48adb4f00---95959165434.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/72029124145.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/76247901181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lwanda+magere+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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10360 bytes
SHA-256: f7ed732b3a587ded2c6020ef75d76382306012a3427f94fc77c6f20d66549205
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16952 bytes
SHA-256: c75ec6e87d31eceb596d3289e04024fef5f41ccc28c84a5a663a71cc342a2f38