Malicious PDF — malware analysis report

Static analysis result for SHA-256 de05ffcf96a46f31…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 10:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29e1c654646991798e4a4c46834e1e9 SHA-1: f5d82cc5954e10c782e14f81968f34e152025b10 SHA-256: de05ffcf96a46f31e49ecbfc7826970c94854e652799010768dc58cc012fb987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates a likely phishing or malware distribution attempt, potentially leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crewmak.ru/uplcv?utm_term=companies+and+their+taglines
    • http://etabetasurvey.com/userfiles/files/59491172975.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/21b0c0dd7acd88053461bb84b837c557/59712141077.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa00f41e15---xizilewezoxolavazomoti.pdf
    • http://studioturina.com/userfiles/files/66645287261.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e947f147c---wefosupodijefe.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/efo8793s7hvo9a4neq30mg3o48/20842511296.pdf
    • https://glycocalyx.nl/userfiles/image/file/92365927375.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/91ae3d99a63025afbb3aeeebef76f307/mukawifen.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7b1e4c10ca564ceb0af858b2bc413301/zesubu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc203785987086df2882a86935606047/58220158858.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/112a956d2048fcdd8581c3134d026c34/faxakef.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a480df0706---10285186574.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ffd1b36c---98962091388.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a175f99b995---naxabaroboweroni.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/97204922629.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0b12a99e---93357351045.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/53264339664.pdf
    • http://dongphuctqueen.com/upload/files/47135277953.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92da10863---30604364945.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/108f1d0474ead3577e1709ec8f6d98bb/dukelimiwifa.pdf
    • http://cpspcb.com/uploads/files/rizerejojuk.pdf
    • http://allg-gyn.ch/userfiles/file/musekedodabadoferamerak.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/52ujmbk9t92q9hk49bt59bj2rd/nifupabivalukilipefi.pdf
    • https://cgeminfos.ma/upload/file/lorimowimuvagiboxeko.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4bd3e0a3f6df5f77e1514b98a0f0e853/juzanufet.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9ed3b2e---tosumezo.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/kegexoxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f783.bin
505a1c089a403cf512cabf2135d0d90b67aaafdf850ad87eb804c2aa5c8c400a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16968 bytes
font_01_sfnt_off0001237a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16792 bytes
font_02_sfnt_off00013b91.bin
d0c0b701138cc01bd6a112bffbfd4120a1d9ba5efe41f2ce6e406db897d1fc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 10868 bytes

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