Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1d6a3993c19164…

MALICIOUS

PDF

135.8 KB Created: 2021-07-02 04:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8f6cd7e097efd8ce478412bad5da38c6 SHA-1: e0dcc2dc78fba091967d41ba18add26de388cda7 SHA-256: cf1d6a3993c19164c61aad75dfd61cad7c05afe2ec5aac4513ba271ea9a19193
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 functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised or disposable. The primary purpose seems to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kardelendalgicpompa.com/uploadfiles/file/52118587207.pdf In PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/16111273484.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/dapinifuz.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/83395826536.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/q87t47c3nqfru52k5dhmsscb3q/74089033235.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c1c9f91b5f538b16d77647c537604ed8/11563736469.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/vopemalazadibanerizu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wemegufevive.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/36c9a14dba5776804358ddcdff1c3c65/79353415321.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lawixunug.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836295e588---busifobif.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3c6cd21b---guxokiledarodedu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1a435848---62998094455.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/90702023024.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tisenagekodowoj.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/76484618866.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/luraxipazepigodoxemuzome.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f582896c609bacc3d6e7096001d1b6d0/86939034067.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726cdf4d753---kekodumofefojajufivanu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/33ff09259113b416aaded121b92f5c7c/74802672668.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/83239802508.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/66007331564.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d72c90f3---lupabapuvolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=introductory+calculus+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000197de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DE 10556 bytes
SHA-256: 8b821a8a9568733e5031aecdf108262fb3e7deaf0172ef4574676480286a34cf
font_01_sfnt_off0001b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B020 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off0001c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD5E 19972 bytes
SHA-256: e1a777a8125950c5aa54e5458d9195a38485fb37f5a8eda7e09787c197c8fbe5

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