Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f66749a3a54813e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 03:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4cf88d05d815ec84121c01c5f6e4341 SHA-1: 7b4b843e4f1e891a81b4f149c27d048802d745b2 SHA-256: 4f66749a3a54813eb427756310163f8d790c73e5d80e4e9b19b200e281fcdcd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many pointing to compromised WordPress sites. The PDF structure suggests it's designed to host a link farm, likely to redirect users to phishing or malware download sites. No scripts were extracted, but the PDF's nature implies it's a lure for initial access, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=english+comics+pdf+download PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335a195a43a---22303926264.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/99647322710.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/45496683227.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/52150550714.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/lulavifujekavimugarexijuf.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/puvololiv.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bukifafufasupafofowati.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161434f787c0aa---tavegosimuwurorutes.pdfIn PDF document text
    • http://cqhuaan.myhost360.cn/upload/files/09-06-17-12-46-87.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/88172766101.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/wewamupakavisobupevejalu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/mivumuzuvupewos.pdfIn PDF document text
    • https://airxps.com/userfiles/files/sutudezodiwitepowemo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uk0qfs66go4indbjl4f9cu76v6/29178693055.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73186690641.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/39c6fbfefc3a824ed5fe10bb640caa16/waboredajosedinegar.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6a0875e5---24211042161.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/24411406404.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/3144048397.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/44558330120.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fef4a05d---somedalutetixepajutekelo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613494019dcf5---55356271731.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/rijebaparumasagufetidux.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fuxugezaj.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 19012 bytes
SHA-256: 2439a5b060b01cab4c315a804c5077291c2e3b73d48c4b792e8d2ad01afd692a
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10804 bytes
SHA-256: 1734723e99a5993deef8388e0498b204095ba7104a62198f49b0ca1681bb7b87
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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