Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e8c3d542132b9e…

MALICIOUS

PDF

77.4 KB Created: 2021-08-19 07:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 393f8842349e9fc3a1d602956d83a904 SHA-1: fa093f4f671b5ff09ccf97bb3f77a3d59a4d26e2 SHA-256: 42e8c3d542132b9ec665364d3367f1da18fb573a4fefc038afb706f7d7fa3034
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous embedded URIs point to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm or phishing lure. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing attempt or a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=hallelujah+chorus+tonic+solfa+notation PDF link annotation
    • http://qbcar.ru/ckfinder/userfiles/files/675993750.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0628a6cb792ac5ba96c6f8da63ea72f3/nojupitavubatemofanixo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7ba379ce---5864847555.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607533da0a0f6---juxavikizimodipasilux.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/mefalutezutaxipezusu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g9j2ptghs5ul2qb953j721l7k6/jolugezomuvi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c76da74518f---lubobu.pdfIn PDF document text
    • http://unityproductions.com/upload/files/96154287664.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/94485807502.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee54fa811f2---lekedezesimifidejeta.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/35112244900.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/63961868233.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd561528126---20061488016.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a30afb80---36101927683.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/40670407142.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5gojb26msel7qhk96pafpvigvh/56098821818.pdfIn PDF document text
    • http://pileki.com/imgup/file/fafarogabi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kaas3jlpl3km2neh3dj6lcta4v/gejaxabufedutaxudoxujawej.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ed2d9k26n9p3p2n6101gchjonl/zutoriruris.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/towanovemaridu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60221800551.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fobiraxidav.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/288v0th3ijkgl38k5f8m68jeb5/81524680057.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/xipipunojenupukawimukom.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/df0073342672746dd50c55bd46c6b723/duxalomobitejuwusipuwofe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160729815438a5---lobiterijovowadojopo.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_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 10652 bytes
SHA-256: b095c120ea0ed2a07d477ef18fc999c8462e079ed67dd65a59a15add90e549ed
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16604 bytes
SHA-256: c0e8d89d96e91b9b47a2b32469d11b051468efe356b01473684f8699ed34f5b3
font_02_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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