Malicious PDF — malware analysis report

Static analysis result for SHA-256 354763f5692af460…

MALICIOUS

PDF

78.4 KB Created: 2021-06-13 19:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 32f0beb3e1ae4819047005f68c1e5db3 SHA-1: aa76df8596fe6a57a0eacef3ac4295ebdc80fbcb SHA-256: 354763f5692af4609b2257e12e53d05d78615c08c84cf6242b11154b8b39e5e9
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure or a distribution point for further malware, leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=x+wing+method+sudoku PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/46a0a3bfb86b316c0ed5b6ff13658b1e/40963554431.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd198a7f4---43906069437.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd5930187---28747546979.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fcedfe58a5531a002b52bf0057464599/1009712655.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce947c191---bukagixemaxoxejo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160770a4b5c126---bumijakexejowusurazeriri.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f87913f9---64921638329.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddbd0a1205---gebuvurig.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e196830d1---41205925248.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087a67b037e0---sidalazomigali.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/l42k9lichpoequi9pk9ld8jp62/mozuta.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/35546930595.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3dfb17bf7b795d73eabbc69670cf8549/zizep.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bijitetalimopumiredat.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/4990debfcbd51e3967dfdbdc80a4cfb5/87828538034.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e26db4a17f50cd60c70fd7dc93e5f7f8/99522145825.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 5032 bytes
SHA-256: bedf140ffa223bfcf16880ebebd202f3e2e09441a5011509cd40b52573a50c32
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11072 bytes
SHA-256: 65ca26f451dbab51560d9bba579a44a9158a4f6c3a42321772721663b29240ee

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