Malicious PDF — malware analysis report

Static analysis result for SHA-256 4810e2de86b988eb…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 00:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 251834a3ac6304bb7d0cddb358d672b7 SHA-1: 75e04da494919d72bc4b7aab750fe437be834140 SHA-256: 4810e2de86b988eb60286a9ab5113d816fb386cedb7f9794ae591c34e14488ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pistant.ru/uplcv?utm_term=emotional+exhaustion+burnout PDF link annotation
    • https://juvelyrikoscentras.lt/Files/file/witigolemopevu.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/fegajap.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/190472dda47649fc14768cab2622403f/95802656697.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef7fc5f49---53282625567.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e2udkjrsqqvllioultajqffc26/woxovaropikenozi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/45cb7687ea6924a6e5bad71ca8bdc75a/bimigibutevosolatokusepit.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/51325588437.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d33e0bd---76052224361.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6fbb8246---memazakole.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/31830687960.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ba863f5b---wopakafizozizixu.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/fuvodox.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e370c8c9ca17ea0bc986a37bed3402fb/91094182316.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5be3bc3d1cd52760e7eea988016ce292/gegoz.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ddc0f0b5dfc83c4592fda4e6deb8e73b/34033501745.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vefepogivoru.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d913e15dc---30234215039.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/8277836147.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/55530441732.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b73897d4---sadukagivotevev.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/54v6mng619hj1v41ddmpsatjv6/luvotovujusodininavaralo.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xitumokifereba.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f082f4d5d283332ca51131e14511b9f6/20501323072.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0eqe7mchlfelj3lvn7cj7tuo4s/fibuga.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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10696 bytes
SHA-256: f58d6800521653316d3fad308544a5640e727a556473e1bf95e619c0128a853e
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 16808 bytes
SHA-256: 46e6c63a58a30b9d77b1d5de6f4be8b522e2b47946b4a4b01dccd256837c9b8a
font_02_sfnt_off000141fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1