Malicious PDF — malware analysis report

Static analysis result for SHA-256 035cb15a8a085fb5…

MALICIOUS

PDF

70.0 KB Created: 2021-05-06 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 65b096feea72767e45b0edea89fd2fde SHA-1: 60d71592ee601d5dc6c2a3a2ddbe3a88fdba3f2a SHA-256: 035cb15a8a085fb51f43817726564fec6437b5b6b137a4cc4a5f165816480b33
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of the 'Ird tax return guide' in the document body and associated URLs indicates a phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are highly indicative of malicious intent, likely leading to phishing or malware download.

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://pistant.ru/uplcv?utm_term=ird+tax+return+guide PDF link annotation
    • http://agendatourvietnam.com/hinhanh/file/13008619434.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/j8afiedq461qsb68nkpa5fr3g8/kedoxajedekawon.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceffe66780---57230180688.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a0a0446f3ecbfe59cc4bbd6175b9bfcf/35299849998.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1660951420e3f8a604ab4e09d4735c0e/65607662164.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995993594d---32489424290.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b3e1e34ebbb50f1d756ff90c7ec0efa6/wuzesudafakil.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44d8b1d853eacf52fef668ab610f564d/15622518361.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8b7df41f56bdec370d1fa64378d1fed3/32896795880.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e9ad93a14d33f1c125e2161b81f25a61/wosumavinubomi.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/302f0c0e26bbef665dbf086273166403/xadepefozadigigumo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070cfba7e28a---19345210691.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/sewiku.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/21226677697.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902ab2896e9---69587579493.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 4788 bytes
SHA-256: 5bc9b2f537ce7a48e9a7eee71eed45ae32f63a2f5ff53e115ad06bf4a8fb6896
font_01_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 10368 bytes
SHA-256: fde69db45ec90d5f4bfefef1ddd1544fc02ad1dd33f28817627022bbbd13b190