Malicious PDF — malware analysis report

Static analysis result for SHA-256 452b730f59db23b9…

MALICIOUS

PDF

86.8 KB Created: 2021-08-09 19:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 60ab09f4eeedf81981a160227b25a7db SHA-1: 3845f3f89c3dd49493283d48eb8417849e8594f0 SHA-256: 452b730f59db23b98b3daf5d70cba0708c664fe19873093082aa44271cdcc450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610450d5c0c6b---panitid.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5b8f2---90514800521.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/23777275758.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ditux.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/jivifa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc60a330f---4338302800.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c86ccf96dcb838c3adc5a27d1a726228/pufukojuzewusuvabawokake.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/vovovivofufox.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/fofivaperusodumoduvas.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/57627443534.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/ralisoxise.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xugimiwemolajokim.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c5a82dc8a432ede1841b99a84b2ea781/45491192371.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/10452011661.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/19503240041.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/jovulevorudobumema.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/82858354855.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ca70008d1b1a912fb3c51fc738b01efc/67132852995.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/penapikiworitiduve.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/nufexozeni.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160809e35da05b---79779770273.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dcf6857df---fazapidolidatiruxepu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/30de9c3f88fddb5702fa52f334f9da13/nibunolinobagefalaw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/157e9e95324585bd8059e9fa69ba858e/xuvokivulagadiledep.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/51883707894.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/lobonizirir.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/91807292749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=que+propiedades+tiene+la+naranjaPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 17644 bytes
SHA-256: 7a5e762ad4800a0f9d4e833f3b580c79450772710581d269b27d3c36ffd5da0c
font_01_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 10676 bytes
SHA-256: cd62f53180a604d169009d3e12372270d587a93a3e75ec1c772eae0a9002a0b5
font_02_sfnt_off00013508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1