Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e2a5350ca39a65…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3762e9cec1e6517c3021f0b9ae2531e7 SHA-1: cdbba58eb4c193feb13d71889c705e341d3f2619 SHA-256: 15e2a5350ca39a650d8bf54838e790e50afad303658bb6403b90b61dfef1d2d1
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 pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a2itsolutions.com/chop/multimedia/userfiles/file/8624326206.pdf In PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0a60945e94647af0badeaa1ed3075bb6/gidem.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/22271457499.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/31777268229.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/votegaguboburo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5f6d07b2---petesefugopekifoxapexowi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/kapaxurimikiguzuwepilivaf.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fewopipokenede.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/53e49e3beb6931225d661087b14e4923/22096065348.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926a392a081---vifijavidiwukuxen.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/xaxorizeverazowe.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d134030---35745909403.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/10675631745.pdfIn PDF document text
    • https://onwater.my/uploads/file/feluluzedukewu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/94608968835.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe374e3cd---gubuwigujewazixezuvej.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f19d1cb58d471682df6521006d9c14c1/36906319732.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/li1348juu9h428d9l2gno6qka5/85206639635.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gatoserekigisafawemut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b4a5e90e---29031073546.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/35b03ec03d2c64251cdd6ea828a081f7/99345065539.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/diris.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tozane.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/mebitetafekuweli.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gunujisisaburapunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mr+blue+sky+electric+light+orchestraPDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 10844 bytes
SHA-256: d97cc35df38d21516fc2980a766d5d5b0ca09dff1a272c59e1cc0cb5e2b915b5
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 17316 bytes
SHA-256: 97bfdb7bbceed5f1adbdf307434a8c881bc42e190d22cccf7db86f6f8031f22d

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