Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18cc6d116cdd3cd…

MALICIOUS

PDF

99.2 KB Created: 2021-09-06 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e51da9104d4855f7e35fcd518b3a3a42 SHA-1: 1cdee4b1ccf3cf70de688cf0ef87c2f436c1aac2 SHA-256: e18cc6d116cdd3cdf944aaf49b650f7da881998e54145a2384a51220be7acdbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=software+development+proposal+example+pdf PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609448b0a5f19---26018992681.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/sorutigin.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8deabdda3---30353520907.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/kasuzitafuk.pdfIn PDF document text
    • https://andrejc.si/files/file/14874696689.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lici9o7fs1ddelfkdvbcasgofi/vogakunaluvopeko.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/94335723923.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/fifatazapi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/20e90bd1783f8882559721f06e14601c/86187250393.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1530f193bcd63f5b2519dd262ca829a5/jofegokowezenop.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/6365233747.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48992423346.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a0d8ed06---46231468191.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/87455331356.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/9328824288.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b162989b4a5dafbcf1cb955bd2bba82/89754946596.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d29fdf30a5d18c2ddd9c5775446c0562/pakusipir.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a3a0b79d---rutewaz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160733124400c8---gududekenejiramolegusiwop.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160946a1cd6598---49106057015.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/17978911718.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c437cac3630b667049024a744a141ed5/38400564965.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/52705su8agqsupt4osnrpp61o8/bigezumepomironidagid.pdfIn PDF document text
    • https://cargobull.cz/res/file/37031809487.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rovezekowetukituv.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_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 10896 bytes
SHA-256: 67e3d79223d0a39e9b9867422d2edd00af2f7c0eb4c1187c0def6ffe4c12873b
font_01_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 18344 bytes
SHA-256: c82041049709842b14d40d94b78cb2cd95f524746e9e9799b6dd88a7ee5965c5

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