Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e8326f09e326ed…

MALICIOUS

PDF

88.3 KB Created: 2021-08-21 06:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8aad872a69977907068d81b0c3a925ab SHA-1: e5479af728554a6e79d4cf1251f2d92e04e6b372 SHA-256: 65e8326f09e326ed9e4af227afbc225ae667369eba008d2ca72a7f0f49f1d9bb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, with a specific detection name indicating phishing and trojan characteristics. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://maturitni-ples.eu/UserFiles/File/87308154596.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b68f7463576871ddaa316e5e6b1f279/70519280005.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/dirusubutenozoluwenivi.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/926428687.pdfIn PDF document text
    • http://epicridesnepal.com/files/vevebomew.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d87aa898a---pojemaduzopamosusonexi.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/padamogi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/6715585255.pdfIn PDF document text
    • http://186086.com/upload/files/51805402031.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/xijuripim.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/kisabowipodudamazugi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/67260153845.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/61742636590.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f2f31e1ce2fef58ae9c18585007e5dfc/96061578799.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/58766475065.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/76651124952.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/51242642374.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021080402081970554.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a55e29fe6---xupop.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c357a8ab7cf1835a63449e923b19f9ce/19474727287.pdfIn PDF document text
    • http://axwelindia.com/uploads/valotiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pop+rock+and+soul+reader+ebookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013818.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13818 17856 bytes
SHA-256: 47f5e3e555d02c51df04bcf9c01244c1378865fea709dee9d36b2cd8ce52361f
font_00_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 10652 bytes
SHA-256: 49d5de2d3b1092f21b5b469fc0dad93d535e0c7eb17de813977e7c8d5295b481
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 17284 bytes
SHA-256: 39ce95becd61d0893fd8257eeb1722a20b86f6388928721ae0136839484e38b8

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