Malicious PDF — malware analysis report

Static analysis result for SHA-256 07355474c5430e1a…

MALICIOUS

PDF

92.6 KB Created: 2021-08-26 10:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc68087b482a45cb94e3c384ae8b144e SHA-1: 411c01d3715db184b0168981d91e0c808ea44537 SHA-256: 07355474c5430e1ada8fde6100f46211d77483528b916866dbbc4c303c1e95d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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 http://taiwan-casters.com/userfiles/file/10116540049.pdf In PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/59278170805.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ropominufuwexafat.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nofaxulolam.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/49890150582.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/36190449511.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/samipavisunuxapi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9c91c4202---riwasunetapimirejaro.pdfIn PDF document text
    • http://cochu.net/resimler/files/19843990991.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0865364d---60712731487.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/78672601544.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/85919782473.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/92726003644.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80662742798.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9l2lprno744r5ogcc5cm989mql/10964600155.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lilimigonudome.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa8af1eae---59996763604.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd1560791---wanodusixabirozinoviwume.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/95683100828.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307682d95f---nasekufi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gclgjufo0h2c0sv2kn1caoc139/69928204288.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/59bc4732a76c78912ef7d499cd5f29d3/vifavanoni.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d39702acbba---28230827571.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/97706994616.pdfIn PDF document text
    • http://aps-mes.com/files/file/93714685977.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e9f67742f25281fbe212eb6b9febe2cc/tivemixakow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=myoglobin+structure+and+function+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_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 11144 bytes
SHA-256: 20d082a0dd9b41d2a6d68e085b38943f88b3821a98c84ca2cabd5dba6d317b4b
font_01_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 17608 bytes
SHA-256: fd3b72034b076cd3705c696c31e72dd6763d82ec8c3440553b80711d0d137ba1
font_02_sfnt_off00014c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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