Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a40390cc480d5a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 05:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cef3f6572dfe1e6c18fd8a87a269ccb7 SHA-1: 133dce04632744a3c357a6634c3e33bdd3943dab SHA-256: 91a40390cc480d5a0d9cd78e2d40fa447c29cdbba7e0ea7b37e8eedf74af4b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://kyea.org/imageuploads/sirunuke.pdf In PDF document text
    • https://balticstroy.com/uploads/files/96196950569.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xepur.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1ba7618a86a13a0b000a2118bec00b31/74676956379.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/4941633080.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/35488197484.pdfIn PDF document text
    • http://erdbau-rauch.at/fagusixol.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/benewuzutejosij.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51d0727d---volevebezu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m931vpkooht2u4ndt48g3pj6i2/3418619675.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/16120721012.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/dudatifufiga.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613548b22a5db---6723506750.pdfIn PDF document text
    • http://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/99627410057.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667474c281---zataripuk.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/84058793847.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/wadibawotozux.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/10342306558.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34024716421.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/volabidarote.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/fodevoxotinajako.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/wasamoxuraponosozixo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/15837173890.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/94246528526.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/92921842711.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/81698152112.pdfIn PDF document text
    • http://belv.ru/userfiles/file/36201683924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=record+screen+android+10PDF 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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10440 bytes
SHA-256: 9cb284285f72baa21120c5760a8236f07e13d6827babc3c5ed590f9337bab99d
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 17900 bytes
SHA-256: 255825812da539adc1be96d34662dd962cf3f90504e1a93315dd2b58c717ddc6

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