Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbba6f3ed635aa52…

MALICIOUS

PDF

95.8 KB Created: 2021-07-06 13:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aad29846ebe27227a2e4974642a7eb55 SHA-1: df04f074f6466e129ac744fdf064216aa50ac708 SHA-256: bbba6f3ed635aa525eded5cfda515d2fac8ec118fc1098be070c014158214435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=quotes+to+make+others+jealous PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db6c9ec56---81364948569.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/r8a21gvnpelc7bnmccenpsrdqm/tilujove.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/ziwovunu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6783dc11c---58825292511.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a870e1d55e7---nanotofuwunaxabedot.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/narofukijevebetabuvotenus.pdfIn PDF document text
    • http://ned.ru/uploads/files/19795071112.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760e58956e---22600071947.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608675d87d568---wesuminisugazijal.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/bimikotoropowu.pdfIn PDF document text
    • http://4bx.pl/public/file/xivenid.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be6ea2e3d---64635637484.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/698f1dc2e08850e803d1ed5bb4832a17/42966941057.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71107d41f---49057338560.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dcd35a5743623e95f6ea75c56cb0f496/37822806642.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1affd4168---lavudugoxo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/43gh8gite4mkl0hhovgoug01vj/subigivobikobarof.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0d336e86a---17876136321.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/11146611959.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/tixilinesit.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976cbb1a079---77029476082.pdfIn PDF document text
    • http://bienbao.org/uploads/files/vigorase.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856b60f191e---rejorewaderejorobitu.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/53680440103.pdfIn PDF document text
    • 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_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 18360 bytes
SHA-256: 9da4802ba1371e76492561ab4f8b533a8e55dad6bc59ad177fdb2721990a261e
font_02_sfnt_off00015803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15803 10556 bytes
SHA-256: c0b1f8537ac87d2e4bab79a7971e0f07dc31e0413e7f720a52e97e4816807808

Open this report in the interactive analyzer, or submit your own file for analysis.