Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4586d6cbf64dd66…

MALICIOUS

PDF

95.3 KB Created: 2021-09-06 21:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36425b140396364d7c09609d1838d1d3 SHA-1: caf34be10d3aa3482ca732c778166c5d7486187b SHA-256: f4586d6cbf64dd66d37a7cc619f6a6009d2bf3b2725f1d648cf712e7d59e1e75
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious or phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71fcf4e5f5---2620442196.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58226b70a1---87357809995.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/be210082cf14facb7653977cfb171762/pewusefoxufokoxituku.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f074ee34a4e---72708035792.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/28124560433.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609935afc6b7b---wafoxaxedaxotoxafiniveva.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968306d1724---xibedesajipudinen.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e82f14fb---62918353559.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/19250473451.pdfIn PDF document text
    • http://jucal.es/images/file/zajuba.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/16400264323.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/95041489307.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129bbe9637e5---83942433270.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160854a54163cd---ruwasajenaxakelezal.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/29401321117.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/33991954115901d75db2db661ea7f111/saloxebele.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/20350773911.pdfIn PDF document text
    • http://primaneighbors.com/userimages/91820843707.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6d1eefbe5f3449350eab317194ab0e7d/67953341003.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/boloziwikitak.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/5872024219.pdfIn PDF document text
    • http://industra.sk/userfiles/file/77221259251.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/lefibusibomafezi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9281ad04---43248304893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=geometrical+isomerism+in+octahedral+complexes+pdfPDF 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_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 11024 bytes
SHA-256: ce2b4ac81cb7fc14ae1e45c52c044dec41669cbceb7e7b983f5f4839ddaad2ef
font_01_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D14 19216 bytes
SHA-256: fa95774323d0635fef32a7d5286f36678a7c62b2474a00c7eefed99473de2a74

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