Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c8334de47dc74…

MALICIOUS

PDF

58.0 KB Created: 2021-09-29 00:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d6acb57c891d23070e0847301e50968 SHA-1: 2f6886bd9f1769b52000793d9f5bdba2331a208d SHA-256: 052c8334de47dc740163fd3e62b6ba116a3f6e1b7d72b010cb9c39cee12ee5b1
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The presence of numerous external URIs and the nature of the PDF structure suggest it is intended to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7329

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=raghav+dance+plus+5 PDF link annotation
    • http://eltprof.ru/userfiles/file/dejofuxubuwokavibufe.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7b38e4d7acd571fedadfe96a395ba631/penopopemerinimigojulunad.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/4101817859.pdfIn PDF document text
    • http://becucci.it/userfiles/files/zekamadumidaxoxu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3a38e50---10135011581.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mexaman.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2414325---28220994416.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/49285932167.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615383eb86c69---lekodadisumibatu.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/vadujugoxudir.pdfIn PDF document text
    • http://falconltd.pl/cache/file/tuguvis.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jikanuvuzagugifefedazevo.pdfIn PDF document text
    • https://motecx.com/images/file/xorekonisukodobakejemi.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/3078120747.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/ximokiwaxuxetipepap.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/84832610054.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/29277742172.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/72682648663.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3bed9085083fef42cf5fb88c73ed4c9f/75624641202.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/leruxipadefizapepenofe.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/2636848872.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911223503730663.pdfIn PDF document text
    • http://esistore.de/userfiles/file/59188045803.pdfIn PDF document text
    • http://orem.mn/uploads/files/nuxufejasorukupada.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 10728 bytes
SHA-256: 13ef4fb22a2b7f369cdbe95dcd4ca7ece2a6fe96917c48478440a9ac66ebd032

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