Malicious PDF — malware analysis report

Static analysis result for SHA-256 de592083185738c5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 18:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4825ffe13861767730a51f5465a5c87 SHA-1: 80abf27897d0b70488431e4158bd7c0f1cdbe1a5 SHA-256: de592083185738c5a25d698543fc03695fd1163d66ed26a8edc6b6e2c67d1c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/bda459d256c0c6690cb79333cc4493d4/77616228493.pdf In PDF document text
    • http://nhs1968.com/clients/65482/File/livutukugos.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/ditanuz.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/tamisepebabil.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/265edcd62c04a6a0d806c50c4581b36b/17187404006.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ueofvbhhr1qjam69d7stnngskd/48407301903.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gdt3l3vfsdj345h2clckpuqueb/tuzidubekerimimib.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a3bdcae6---zoduvevewotineluwinuv.pdfIn PDF document text
    • http://atomleasing.ru/media/File/baribedusosugip.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pojunajoxubomazifaziliru.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cce4eeb66---kunanikanosukimetak.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/22616084500.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb97f2127c---6639813796.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/xijarozak.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/nozaxuravoliruxig.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/haqkb0ilb5fhukgu0gjsks2oq3/98114300796.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/68162828293.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/6439529106.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/5358070554.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160faa30a2dcd7---6346179731.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/pinasijepitemorel.pdfIn PDF document text
    • http://cissi.it/userfiles/files/sawasimusovuzoz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb0095fddb---81185639757.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d352fec3a0---41492183272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gerund+or+infinitive+pdf+listPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17348 bytes
SHA-256: b57d0348b9f47b2daeccf9b1b9bbb94309c4b2850d1c9db381ba6a230cb6d164
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 10536 bytes
SHA-256: a3d6c0299e2bebedb545a97a4209b738b47d7714b417d2b5ee1eebb99061b51a
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1