Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b426ad1658d0f7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 11:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c79653d0a32173c49aa57dc3d4372284 SHA-1: d0b9b40eaf2ac0f075e1ac8555b5534f808cadae SHA-256: 75b426ad1658d0f70d45603240cafe50f01efd2a086bc19ff629738dea9cb241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often with UTM parameters, to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=kodi+firestick+update PDF link annotation
    • http://vagtteam.dk/userfiles/Files/50978291825.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pudesikofivetabiwirofob.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/dowujo.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/57761461339.pdfIn PDF document text
    • https://edarky.net/data/file/gepofojudubufevakokira.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b05fb8e1c3f8e93010d4ca437dbebd5/defobakilizexerukof.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/rapalididexixugopesazuru.pdfIn PDF document text
    • http://lagrupacio.cat/file/gozilomifipiwuvoku.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210916083803.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/saroziritiwovabotelazis.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zuputunagukazexamilu.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/wopewazonalil.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/49802167291.pdfIn PDF document text
    • http://superbarter.sk/media/file/gedimonolatudi.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/27077776325.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/47195141408.pdfIn PDF document text
    • http://skncn.com/u/files/63300840275.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oa3l0ih5oq42i5bc3shm423efi/93981459734.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/bujeribepufix.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/fasorodit.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/wexuxufowidiwi.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bolexikozuvafeto.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/990b42c558083f8fafaf4e8ef0999533/41374852017.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/fikexosezisepir.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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 18320 bytes
SHA-256: 13e8e39bf4ff08b0af701ae93088c1910b72b7788044b3b7d53b8be83da7da87
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10648 bytes
SHA-256: c1dcb64e006599e3f4790fee01a8fc33631d574f24416acff029dfeb8f43ae27
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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