Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9edc29a3f25568…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 20:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 364dd3dbc235d3ca2565177d27270628 SHA-1: 5b1b7ef37f8cd4a0727497663836b8769f1783a8 SHA-256: 9f9edc29a3f25568b588d6b1ccfaa581210eae58928934926a3ab957f9816193
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://live-lessons.net/lcj/web/uploads/assets/file/kewilogapibawuluga.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161359de772a4b---vuwemuw.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/lilesot.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/nejifinigiwuz.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109131236088752.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/42353250288.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/97792600532.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/roxumavonigepudila.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/takikoxezunowijoju.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ef4d89e8---xababojomijamut.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/21742178343.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69751673843.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/zowatesamasam.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tefavexevigufitaxex.pdfIn PDF document text
    • http://usateatop.com/_upload/files/34894442309.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/37053534727.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/85711351658.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/kamebabefolopegudox.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/12874760989.pdfIn PDF document text
    • http://vladekoservis.ru/files/15420788919.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/todobigibujo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii0d5rin45bbmhru8nk4c1bbc5/84310680802.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/76298718497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=jeet+kune+do+book+pdf+downloadPDF 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_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 17644 bytes
SHA-256: 75e3886548465d7f331215f1947e15c19d6a7d83a19028c20593330cf99371fc
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10540 bytes
SHA-256: 9c6c42bfbc23adcfe731d633e8bf076b723a15912daa081224f0a53309622cd3
font_02_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1