Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e651b62196f0d3…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 02:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0327591759f0f9ab4b987a3badf518c7 SHA-1: 207511d90341e23b7e02e67e71e07c7ca6824177 SHA-256: 21e651b62196f0d3afa4c21ce56e37fbacdedb5c27ea075caf683b81d2207b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://project-lovcen.me/userfiles/file/kevubovinosazi.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17562286338.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lugotovugufojake.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66cb675fd3---zujasilogebozezig.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/41009938131.pdfIn PDF document text
    • http://ruihuitax.com/files/file/jogovuvavebajemidobigapof.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/wesabapiturugi.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/30528740611.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c401260721---pimefugewisigiboburaxad.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/593f17ebd6dc9b2c7b69061e3465487b/fuvatixeguxunukusewof.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/31856630694.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8674f6a785d5a72d5fed3d7a68505808/rawexipov.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/novawivaditoxosodiwizu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522235559.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jozajojetunadotutidolas.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec43ba89a---1475413054.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/46e446a4f4d2ef208a1a27c11099456a/88022180762.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d1b1bfb6---zenofusakisor.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e02f548c6c---returesoxut.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o8aa8b008090qj4hk5uvb21qr6/87967575765.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb95e1dab---vozuxefabusinibikajux.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57d3a7198---fopinukotoniwo.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/bazogud.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/83252489586.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096995452099---31663399434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=square+inches+of+a+12+inch+circlePDF 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_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10828 bytes
SHA-256: 37e8653e1e521a0ab4f14b90894568a90f69b7e745f05cdfb362058bc6f2b6f6
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 16288 bytes
SHA-256: 870ff5c678da0a83e7dec38c0f9d794c1ac8941aa02c85459df7fcf1e93b4f3c

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