Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c57f8209cc7f3c3…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 16:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ad92c63e70b66ade5152c3b4148427b8 SHA-1: 98befae8ccd56b901115517753613d1aae6e129a SHA-256: 4c57f8209cc7f3c32c1b36fb514e305b6ee3985dd393cda3424b2a7f9ec795be
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ece755b19890f544c99ab76ae580653/jutenumejisakuzopevizumu.pdf In PDF document text
    • http://teplolux72.ru/upload/file/temujibevasenin.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/wuvuvunut.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edf3206d1---zekev.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4872eab0---dejedoduxubexawixeso.pdfIn PDF document text
    • http://vinamex.info/uploads/news_file/63394607031.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/dulajavovoluvasuvisozalub.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d56eee42798---75662777724.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ab2aecf946bb1bd60cf2a50d336f7f66/36283737874.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c814ef5ab---36682936348.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/81507336db8d68bdcabacc6409dcd66f/25491965814.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/48c1fb5659ad8f82d5385baf9dc71630/dabesevonotirokijuj.pdfIn PDF document text
    • https://petek.biz/resimler/files/niwodomis.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8bb402dc87e16143b61749a2fc5eefd8/salabomunigefezuvetujex.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/3058877503.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/49102752561.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ef2daa9a92bce758da8a4edf589f33c1/56344237607.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/rubenowevutu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cef54d7f7---rejivibosiduru.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6c58de0a0eb76a1ce6a05070ca1b6e5a/tofixemoditukaguridoko.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7379b0a18b---19470690737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=just+mercy+streaming+freePDF 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_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10720 bytes
SHA-256: 7415cb88ebe65ee68b3fe753135a59c566fe51b520090e1f060426a0d4b33755
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 18272 bytes
SHA-256: 6a1360d094088901b0fe785ffb2b3d0c806dbc6a9b609aa35dcb754b698dbaa7

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