Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc9c7e952a4dd95…

MALICIOUS

PDF

99.6 KB Created: 2021-10-09 20:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1596ce0c43343e5664507183ee1e64e8 SHA-1: a7aaddb348e7ff7b678ffd2859b7e400d3ea94b4 SHA-256: 7fc9c7e952a4dd95c0f6bd2b62bfc7fa9389c8e244305f4ec89dff8df37dafcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=what+will+keep+you+out+of+heaven PDF link annotation
    • https://libertyrealestate.in/ckfinder/userfiles/files/vevokefaf.pdfIn PDF document text
    • http://trubaopt.ru/content/file/xuwamaluzime.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/81399534295.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/18089838267.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/57171919175.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/vepawilobiforanuvub.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210928054224.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/jifasepetukadewireva.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/90329557476.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146dab812bc9---lupaponamojedokibesexu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/33240098252.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/84121899968.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c20a6e8e2---maberotadowedepozep.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/jazojoxipunolef.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/12343917050.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/dizafora.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/ritil.pdfIn PDF document text
    • http://hexindechem.com/upload/files/tofototegozozijem.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/nuvosuxuwaziturumokoto.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/kepubedi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/grl5q0ul11qbjqb8153n8402v3/zawikevoraxuvewaxafofixef.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/lamuromof.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_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 19084 bytes
SHA-256: cb80feb940c23d38b19b80a2ae05559e44430879949683a427d8876f35be01de
font_01_sfnt_off000150b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B0 10640 bytes
SHA-256: e2526934e0d800336398b6ca90b3c6211a7bde63af07e7180776a486e665082f
font_02_sfnt_off0001690a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1