Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff913c8164812b8b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 05:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 266291735b571b48e700b5f6e5e84e35 SHA-1: 3efe8df31390cbbbaf4b0d7d4c7c052efc780ea1 SHA-256: ff913c8164812b8bcb1a964a32a5b51012afedd7f216f0e835b61226f957d7b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=another+word+for+tidy+and+clean PDF link annotation
    • http://kimbuunguyen.com/uploads/userfiles/file/49750096185.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/fikabilevux.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/78175532428.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/22252539022.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f0561ffd2e6c796310290077936ff63a/67900359754.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/42982918837.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a5854e8---71362459539.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/topizoxivuzobigemu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cc48755e00deec5dd548121625f7e7aa/bunitakawebijejebiru.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/makizefaxufizuxewarowa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a37e74bf6---3881153528.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe4c629e4---boluxorivuri.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/pekofixirubuve.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/82448958464.pdfIn PDF document text
    • https://ivanamihic.com//files/tozolakenes.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/toguwatifivazunewanivuzut.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/26480852931.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/69762340891.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3cd12bc3407ce64878baf6862d07fc5e/3118038529.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gitiwunokurozez.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacaeec765---norefoxowaw.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210704_EBB446E7AB9A3B52.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d10834d7a---jubefakenumewebed.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 17776 bytes
SHA-256: 544444cb8337039e6bf867b173c6dc48f5470d3c9dc368205c8531607bc6ff5b
font_01_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10584 bytes
SHA-256: 31ee3e54f1fcdab885db29b5d89221412df076dbf318e66205068fc13cda6ef8
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1