Malicious PDF — malware analysis report

Static analysis result for SHA-256 2284cb7b02f41b71…

MALICIOUS

PDF

98.0 KB Created: 2021-08-22 03:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcaa992357d36ae2a048e8eda2a1e301 SHA-1: 9f4ab31cc22ed489abb72d6ccc73e5442dc062b3 SHA-256: 2284cb7b02f41b7197ffa7f472c676f7f7a3c7e7d1a4419bbfb9402dab0117a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b853720a6---tusaxopawan.pdf In PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/loruxesadifesazijirom.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/3601174996.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083797e37a07---bafevig.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/wimiwuxazefixibixesebagum.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pediwebubamupesej.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e715cc1f---bukidiripabixexakerane.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/tarofenodebesojakusum.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/49737234575.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/80456826219.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/69519404507.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/rugepisomowurazexev.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/42845579428.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/mawomuxibomizi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0707027899---27050590956.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kemivazomugepupeboxizato.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/73939036447.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dd5d550631a97a53166ba5337d2c672e/xezazeradupilokofewamaxud.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/repagasaguladeroval.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zokaxuxunujumufugigozavu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r177jeo8ue4fcbcldgvo3ts5ne/debib.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/nevizavutat.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/vuxafoxekukisagifunido.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/noluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=full+hd+movies+2020+appPDF 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_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 17196 bytes
SHA-256: c92ff5db51913699e154ee96c62a4356022ab2afec1817731350e04545bc0fca
font_01_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 10740 bytes
SHA-256: a9eb15aaa67421c8d31bae0cfb58b49a3dc059841d3f0c3f74c1c5e8ba38a434
font_02_sfnt_off000160e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1