Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ceb34b5d18b79e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-23 12:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d72a4cacf2e4dda121d6841090c83a8 SHA-1: 4c4a4759f8b47a588c8aa2272a17425e7c495bbd SHA-256: 89ceb34b5d18b79e714a4df91d8c5bee21949beed75aa511f32e9f0c2bd0842b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://alexlunacoach.com/img/editor/file/jokipotizi.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28461be15---fajaw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081259f79d92---64675393175.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/71555873998.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/99001028856.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2g23turjg64fapcj6ffi3fj30j/teluk.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/31293432698.pdfIn PDF document text
    • http://24cvety.ru/upload/files/nizawasu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107012335191428.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c628a46b824---45724479160.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a352f4f9---gesusubuwovidizozem.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/22587084303.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078443ecec3e---minuxugizenusutitom.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pitulogesofedaxazo.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/7388521056.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a050ab38f5934f91cb8f9bc508ed982/xagif.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vemuoskuldq1kv2js8nchhe2ia/kimuwizixaxov.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/4130918251.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/69408393539.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/bazan.pdfIn PDF document text
    • https://bio86.net/fichiers/574049315.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/93023130149.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/77895130680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=town+hall+level+7+max+upgradesPDF 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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 17272 bytes
SHA-256: aca803c130fb79d8353f0cd0861ce6169b0321a6765cc7c48a729220d30d47ea
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 11016 bytes
SHA-256: 5e07cee71b5634b9cff380b06c9f4c591af7da29ee5daee13f38e20f4fbe85d5

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