Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d85341349b1d5…

MALICIOUS

PDF

61.1 KB Created: 2021-06-25 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d4f0811cfc16650f75060d45222b829e SHA-1: 30d4b9ccbfdcf947d99e556e57ed9e6c4db8f213 SHA-256: c18d85341349b1d511f3f8a4cd74cdd124ef207443f9ce1f644bc72419410b5c
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The embedded content, though heavily obfuscated, does not contain executable scripts, suggesting the primary malicious function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://superpart.com/files/70594380544.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7d3939ba743f8b39058bc883c60178ac/22139160772.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362de4ada2---dumujoroburofab.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2b8de5af74c8c5fb0c29d5265232af15/37082481976.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/10867683572.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/zeloneguvabujegulik.pdfIn PDF document text
    • https://termoformat.md/img/files/10259805648.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd89d440a---61636260657.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/75080767192.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mokazipuzag.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1b31ab5e---10491601438.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/sobulogiwomulisigobis.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/porizigixokotokerukix.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/14354250784.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160853236ec0c8---77377213279.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c204dd452---mazotafexelefewetugo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/96gpksd43l1u772634f0rgtbo4/fokiwudapiruvokuliluref.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/giledogavaniza.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529000256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=demonology+warlock+leveling+guidePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 5396 bytes
SHA-256: 2ebaaf7dad8d04a6dae8a3872c4ea294811f7c8df72ba9983a4f64beeaa6f2c3

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