Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c5fa1fb393e6e5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 968f22dc301c20717afd1006168d5e6a SHA-1: d1fd5df8d32cc6926896a70c46147c1f80e75eb4 SHA-256: 28c5fa1fb393e6e54ed3152486c5c4a2f4a3e470d98991997dcb4bd4a21b11b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing lure, likely attempting to trick users into downloading further malware or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://khaskhaan.mn/uploads/userfiles/files/luxijijafabunozekolesowe.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/25462494162.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210629034936-muwowejededupojaxezutipom.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/84513763584.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/85118622820.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/44795805437.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m7mgrrjk0qc921gtisnssqf7c2/37186027330.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a693468afd8---tagopixejapiwulagudoxof.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/86406029721.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/43527580120.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/12278531594.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078274ec5aa2---20160452937.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/81767485370.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/18478167159.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/babib.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kowavoxut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b4f2fd6de4cbdc7217c927e806ab0835/80950672635.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/salonidofelujifa.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/tazitadusotimili.pdfIn PDF document text
    • http://dges.in/userfiles/file/lonabavuxako.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pqse7o9mrnhvr3hts27jc1p8cd/54123018013.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/tasoturuzanelof.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/70708488698.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/37106625117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ms+word+2007+pdf+converter+free+downloadPDF 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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 10960 bytes
SHA-256: a8c9469564b1174b4bb91b2a4cbf90ea30eb25c39ee63dfbf585fd09ca063b5a
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 17364 bytes
SHA-256: 4173a8641292e88a0e26dd1b5711cf0aa13a284ad1dc2e5f9f82d6edb9c78670

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