Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57456d7fe1b9331…

MALICIOUS

PDF

72.3 KB Created: 2021-06-12 20:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fc54d73e36157bd6b75f03d4f98fdd4a SHA-1: 3ac700a25e25ca90a8da8b56818c8dba4c0e1c11 SHA-256: d57456d7fe1b93317bc7cbcec30782ae3ec9cd3c94e16d7880daac54dd837cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting sites. These links likely serve as redirects for phishing attacks or to download further malicious payloads. No scripts were extracted from this sample, but the presence of multiple compromised domains and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=thomas+kilmann+mode+instrument PDF link annotation
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4731ab92---83195940637.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/65b7bcea5c6d7a2fd0dd3be317609046/derobitureram.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2lkur76te1qjt3mnv7h9uq3h20/dizoruvejerokinego.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/55157485510.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vesodasofironoraxafogagu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4a289a4f55c12806897f66f110f3a15b/42283918772.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/61084414753.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a067205bd42---kamudurumosenomerinijejur.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/84610413105.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160719db65480f---44595639302.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d083c93d618bd34638dff3c053384ddd/jarijodejipetu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/11943943779.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qcea00gs96dvqgnq0bbq7i1gau/28136584318.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63e426fd1---pipix.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e3277bb36cd19c1d64d924a59af63818/kozajefav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 5080 bytes
SHA-256: 71922d0355aa65628f50adc5dc4a93b13faa6e8aab455808895f3a790ff25f8e
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10848 bytes
SHA-256: 7f3b5ffde5f667616baf3d806bceb9c87752fca6e4beea6741698307ab7d868b

Open this report in the interactive analyzer, or submit your own file for analysis.