Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c36d66e99911b1f…

MALICIOUS

PDF

153.0 KB Created: 2021-06-06 13:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5d6eb43481f62ae39b5a9474a83a9ae SHA-1: dd8501b5502ec3aaab07306e0d93689a647e9b9f SHA-256: 5c36d66e99911b1ff2c59c93f0440dbd5e58855869da18d84074eb8c39e1c881
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=libro+de+desafios+matematicos+3+grado+contestado PDF link annotation
    • https://luyenthitoeic.info/userfiles/file/kunejumufumupeluf.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16076af1f67960---jajajunukeju.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b429fc3a8c55ea64dd1896baad8f9cd1/safuwasunetuwiwebaxikosol.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6fe021a9---zovaja.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a88d374f8---88682981587.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b56196d74e27f51d7b70f0d59d323b9c/51804608904.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/86028304465.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/46330842749.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3dc850e07---gowavogifonasuboxegokuguf.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/ximorifikavagogizepa.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/4594506679.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b26598f28---dorakesizid.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vezubexisigeduxoziva.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/sewemugakafolopomejimepi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cca15ff84cc8dfbd5310208ccc98c675/8877535272.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609920a03ccc7---42335846092.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0acdd105c---61801799197.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac120172380---74986819940.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160922ac4533a4---83843614808.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C9B 1876 bytes
SHA-256: 968bd04a157e552d88f3ee2c1a0fd2b5fa89eb4fda692a8fd1665e222668c687
font_01_sfnt_off000215a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215A6 5556 bytes
SHA-256: a13f73d2bb458139af5cfe1d81a5c5be73d30875f1eaa626940c53febfc38056
font_02_sfnt_off00022875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22875 13780 bytes
SHA-256: 9b28868749ef3a2d7386b37a0e9ec2a93f7a3a111e0a053ee4decbdba8fd8f19

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