Malicious PDF — malware analysis report

Static analysis result for SHA-256 511dc6a2398ccb58…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 14:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 160dbb34285e84e6527c9a7dd789e631 SHA-1: 292c2cfb7043179b15a97e8ca5768edfb0d77713 SHA-256: 511dc6a2398ccb582dd292903aef032bbc8eb6c712e234c18355e177b391e755
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f1c736f0---gumesepomojipabedoze.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c669799acd5---bepuma.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35a28b3c1daad940c65edba66d07e4be/51344878938.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098377af1321---85643765670.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/pejojelulixutarebab.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a48e11e26ec4569e477d143408efe235/lewaxu.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/29964068781.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ee441930---kawibifesugag.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/rapupisitanokudafigubenef.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160864c3653c2c---69423315561.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768b4d08578---58634223293.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9b0fead3c5887a0bcf0bd64280364548/74299937911.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1dce8488---64738940595.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/na181l1gesk44b3o41ddpo7045/25600749979.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff893c6206---17360583584.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jawovanuxabifirugefopak.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1e2e4e8cd08245abb07c8181dc193a81/betopijenekoniko.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f226355a42e0d23262fe4bc735411eef/dowukezekuvusela.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wumajalud.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ef06e17d832f8a851a0504c1fb3c1d22/21007119785.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795165a2f90---fabevabuposomi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832f30e81c9---zijiguvixoroximotux.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c11046a3144---vanosenuwozefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cute+pet+names+for+your+girlfriendPDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11084 bytes
SHA-256: e5005afa33b006276dcbbf2065eeee39b33941e8c236bb13c6707323f32817ad
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 17100 bytes
SHA-256: 9c35afc22c4d63b5fce9b7eeadb4d6724ed17102a000cbd27d4488c3cfc9172e
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1