Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfd01720bc076e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 255f067d9ada9916935191db97c8d969 SHA-1: 34cdfb4aee82b4cc5553721fc9989a11a20786b5 SHA-256: 81bfd01720bc076ea22f66a17efc5696b988dbec24ecb310162482cc25fa7920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to sites hosting further malicious content or to conduct phishing. No scripts were extracted, but the presence of external links and the high confidence detection point to a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=enseignement+moral+et+civique+cycle+3+nathan+pdf PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c87f2acf3e2bd34c4011cd1445e9beb6/xalakaxadimadibe.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/10048408975.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fab89f33---65193328102.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac32f8a083---36724676606.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0a7311f705ccdd8f15e86bb9d9142ab2/fevudebidagisulufujo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e54e332e5---gomatedujinimixiluwewatav.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ac91aa30---71134783875.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/feziriketirezunonagewite.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/60240127819.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7f7553ff---62327181916.pdfIn PDF document text
    • https://alpinashop.bg/files/48219436199.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4215a8659---dujoxol.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/waninijegagilat.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb867ed377b---98051675298.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/fabeadf8af3e4cd1e6124f2b4b92177a/zeduriwedosed.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/90586479239.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82d017410---safukatexe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160892d001ce9c---kubavavefunonafuzu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8a37d2a01fb5cea0b3aac79b355e81a0/39021934683.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/82638675813.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/93260533472.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nawezifizosusajenoguwemus.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/80286029692.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf9e3c7e80---62687626065.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16118c658ea214---supobofedagodosevifoduzog.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/10087629739.pdfIn 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://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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 20300 bytes
SHA-256: 9e97af5551d83148e5b4be6931a8be9e2ec4b30a4203926e007e77984643198b
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 11648 bytes
SHA-256: 44f420328fed3524c8ec6230944527bf28234421dc95a2403e48e4b242f8e31f

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