Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f962647836592f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 00:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f2f210c9812f7d0df0a6341ca4d29ce SHA-1: cb98e9b768bee5e5819c5ea01b1d2e897884519e SHA-256: 78f962647836592f4bbcabfa558996c325e598fba411bdbf45f5acc68869d528
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/78d9e7b7b8f1e39f771bc0f2681ac574/segow.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e647850e---fenegajamabe.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/8395337184.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/30368440724.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/58qak9h040g2sbf3uh1p0d3607/fasimaxukafokimo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210821205911.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/34611891483.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/rinapufudemovag.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459790632d---negofolibibemojaxawagenib.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/navupusugenojinud.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/berarugewupiwakil.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7719c60476118608783c3dac0639b8ca/86652607856.pdfIn PDF document text
    • http://plncse.hu/php_data/file/vaxozurivogobowuva.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a57edade950fb146d576bc5adaf45953/25052466420.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/1124168400.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pewep.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/90125590505.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/vimemabajixurikuka.pdfIn PDF document text
    • http://potlista.com/file/files/43441970384.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075749c818d8---kanusopizamipagal.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/92847254910.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/feramixipaboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mapa+do+brasil+estados+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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 10520 bytes
SHA-256: 491923d524ea4a387eaaace3642dcaae38686ddae90389a23e80cb7b46f9ecb7
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 21516 bytes
SHA-256: ce8f9c61d25c88b10d274f637b0cc9561ed5d433a9672ae51bf88e7be6206263
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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