Malicious PDF — malware analysis report

Static analysis result for SHA-256 13763403c26615b0…

MALICIOUS

PDF

87.3 KB Created: 2021-08-07 12:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ee983f5343dfaeafaccf3509b76a39b1 SHA-1: f33e28e5a139ff5f27337e4dee0edb25fa0e462f SHA-256: 13763403c26615b0590039c40b703196bd60dcad57dd32d80ea289b41a1d43d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=how+to+do+shoulder+physiotherapy PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bb2c58e3c---mukumudibawefokegosi.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/4625146897.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bdb2e536---6079539710.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tikajixukuluwavil.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dd6c689a---tagaseselizebelanes.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/34301579903.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210712220204181.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210522185357.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95ba3f9d0---41225938845.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c51e19b1692a9ead50e5bf2d592f67c9/xugamejem.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/324c37814cf1579ef8501c31992fd0fc/73829586239.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vv76ioq6ghb3nvacmuhgvg0siq/zamiru.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/4137536529.pdfIn PDF document text
    • http://silver1979.com/upload/file/90841231735.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0b929265---nulogixujewexofuju.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0927b985a---pebubobopej.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05575230a4---22160982098.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/73672862253.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45843006162.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/tuveviv.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210807041733.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 17228 bytes
SHA-256: b0ad6ede6f4e20ca1ce8133300c199d67564dab7d2d74da1c3ffca97ad05984a
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 10676 bytes
SHA-256: c87b81ba9e574a273da2d01793bb43cc226cb5cdf1dc56b23a3c4ff5490f2f05

Open this report in the interactive analyzer, or submit your own file for analysis.