Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd1e6ca91670b71…

MALICIOUS

PDF

92.3 KB Created: 2021-07-12 23:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c856e294c655fbfe0d2ab34e65058b17 SHA-1: 15eff3695f56b0fff4d6d559af97fa23227e2c6f SHA-256: 4dd1e6ca91670b713d7f6cedcc8ba8e39e05c4dcdf929c869b1ab192573c8cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware hosting sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=i+485+case+is+ready+to+be+scheduled+for+an+interview PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29c90c4dd---97229285002.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ad6db15c---tutufamosipe.pdfIn PDF document text
    • https://le27.fr/docs/file/lanepojawamozoxozitujad.pdfIn PDF document text
    • https://altbuket.ru/files/13782436673.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/59408327344.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/gokilifazatug.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed983be03e8b1f31541b435661b440f6/gidipuxedirax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0fe1d0d6011a7af7eaf0e52fa9c49dcf/67901303691.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/topemis.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb3c84cce---jorogeri.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/12618706676.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae85383ea9---98196148482.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/71547226731.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/52547592310.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4060d18b---lujixoke.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/boxib.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/83c7bead4f609647f3491365db46571e/mejakijujivikutufumu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087318c13ceb---dafode.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/76979299140.pdfIn PDF document text
    • http://moristas.com/userfiles/files/40328753648.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ph9pe7i4cif8nudjsjnj8ci3dl/jezekujipejizuraxupaluw.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/29421938138.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_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 17056 bytes
SHA-256: 9651603364f624bd6ebea65022c5db681db00e0764fe03cc9e74e37c17141264
font_01_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14693 11452 bytes
SHA-256: 0b252ac5483944cdac9f4355103f3a3b1ab58a255dba204445bca2e48172568c

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