Malicious PDF — malware analysis report

Static analysis result for SHA-256 caea4c33b8b4c764…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 09:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8e51e6798abdd5be9e69494e33607ea SHA-1: ab52d2d04f5f331e37dd828d57a6e9c5bab70b75 SHA-256: caea4c33b8b4c764fe06a23e2f951849f1e63c83c14ab05b23d1eb8c6f747b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites, suggesting it is part of a phishing campaign or a distribution point for further malware. The file itself is heavily obfuscated and lacks readable document body content, making its precise function difficult to determine beyond its role in linking to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/227a1e56526599bcf935a6623c60b5c7/gadotut.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160717fce75095---sokiposavanuwetozez.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0bf559672cd82cdfefef2053d173200c/temubizakedatemo.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/70620587276.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sawix.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2918bfd3d7b904facddb192c50bfa3b4/35565107374.pdfIn PDF document text
    • http://nemalipics.com/nawafivujil.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2f05df4a2dae091949e1c52b33f481b7/63613567195.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099708a65a19---91770732534.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/20506483308.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/netawuzivewefigox.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fipirerubif.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/34581243449.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66934467857.pdfIn PDF document text
    • http://venkateshservices.com/uploads/jaboduku.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/dinarozesib.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210627_868393FE2EF8A052.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2c2d6a7e---45628775730.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/53764640589.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ecad59a783b88da748ed129a80235f84/rubimunepikafekomini.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/genofububajaroji.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kgoa4d3o0nu5rjbkrttd6mf2o6/kegujigip.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fepudinolamafifoleg.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/misadudaxedup.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160911b533ee18---40461035223.pdfIn PDF document text
    • http://risme.vn/files/mepewedoxup.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/24627566755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=concepto+de+coherencia+textual+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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 19468 bytes
SHA-256: f9644279ae73fe89f021b3949f7dccda144d01a4ece0a73a6ab8fe9fc1d7de90
font_01_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 10784 bytes
SHA-256: fb3e7462bf7535624abb8dc95ffbee59e9b1fe8fab5894d74aa39b9abee9a9df

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