Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cb6df91232c58c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 07:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9954f5be6ce490a043ef73916b01aba7 SHA-1: 0af85d90b568298f2a421339419e90781185d070 SHA-256: f0cb6df91232c58c3062cd584c640ed33c81ef31d82a05a584c29935c64acc44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the detection as a phishing trojan indicate a likely intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=atomic+radius+period+3 PDF link annotation
    • https://kujainspectors.com/candyticket/uploads/page_images/files/53702086440.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/ziwuvufobopurukes.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/xijujiwotiwike.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b94313b8---zogigejevofu.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/29409912285.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/rikexovikotixabapemud.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326652e6127---12990953924.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zaxunapakikizotuf.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/87429890511.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/11329137347.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/66687810164.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/zodipikufeta.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/getijufetetogazede.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/16882544330.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/15153367052.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/19574297199.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/88075853795.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/30059525646.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nubexabur.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368e7ff1248---lorinesosegunekafema.pdfIn PDF document text
    • https://mar3ol.com/Files/files/63980812502.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/xawusuvasifojokuvakozake.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/97892431334.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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 10780 bytes
SHA-256: 8db99655aa6d695eb069dce2b5a5ae2d8595972805bae334871b3e5aeb752560
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16528 bytes
SHA-256: 1f8ce8edb4099ef1a1b427168dae0ff824387a82561ac9c343567121ac5bb60e

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