Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10261c03aebab2d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 06:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 389ea34f8ea734ab28892b1a061e0d2e SHA-1: 8843d33f88467dfec108451321fe48183083b6e4 SHA-256: f10261c03aebab2d9a1146fd52de66d9b198ad2658fa7b488ecef6f0c9d4b7d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=autodesk+inventor+professional+2019+tutorial+pdf PDF link annotation
    • http://webinaris.net/ckfinder/userfiles/publics/files/xatozinevex.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6bd951ce134a83c54b27e3c68606c92c/xomadorofewuzadojamefu.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/59448036589.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db92a02896---56835225673.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/jalejumileruzamiforixu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e1fe44fa7b9a06e6d25766402676cebe/sotulividov.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f33ab04d---lojujanegajeliba.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/sosezotegero.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nebubozotigezenirawose.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/ludowemivokivixuzubovijot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d733b947ceb---xabejupoza.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/27031643927.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/majibod.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92ce7b560---senomogedefepejol.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/33814653024.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/pakeregegovebufos.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/7065180329.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/gonazotedofalujesu.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/zejogidirijejad.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lokoj.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d0ebb82b---13064190126.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/rijetoromifegukajozal.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/56028394965.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_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 11192 bytes
SHA-256: 18bc64c69a451d08592a3f22990f38890f55a1feee2b49a9c1a80f00ab1f7121
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 17276 bytes
SHA-256: cf02fdf2b1bb9ee5b7c11317a3c2b31a760bf9ca8a3f03d101c679f002fb4c3c

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