Malicious PDF — malware analysis report

Static analysis result for SHA-256 32090985ef820817…

MALICIOUS

PDF

80.9 KB Created: 2021-06-16 06:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c4b04e635706061725cb5600b87cb076 SHA-1: 2e6962fd88efd1c58ab776cc1f6383488778ab05 SHA-256: 32090985ef820817137dd091eb8228de2a97194e2fd38690818fa0dcd65ca647
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 heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=example+of+romance+in+literature PDF link annotation
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8d84348a3c4ba1da3ee125d783bfaeab/22841969302.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/883ed73c0cf28e7d9d652c5b61dd6fc2/34307497700.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/padufapifatigufakodekajuf.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/bf3defb73539631a759e0203332a7a6a/2805291234.pdfIn PDF document text
    • http://renovator.cz/files/file/bujusutitev.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071607b22faa---68034740957.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/53ec53e2502daea3a08c716e362cbe20/90863719124.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/27790976134.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/99736546299.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0e033915e26ac29239fc694fe7b91068/gonepugigojavilijuxif.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cf65ad7b---wajotipavonakigago.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c8c1e556d0b20564c94d64bed1fd125a/dipaw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6234c9891a---10616380147.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/tuwofusugu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd07595ab---69777642634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 4888 bytes
SHA-256: 731f8a3dfd80fc971e448bd048d036c8af39dca6dcea1a78b744c0505fddbcff
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10712 bytes
SHA-256: 1d40c8ecc7aae4f5b88404c0238519dea33dfecd0b0cca632558ba09fd3f394b
font_02_sfnt_off000128ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2