Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcceb5b2af55495…

MALICIOUS

PDF

112.0 KB Created: 2021-08-14 05:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1dd1f63da81212b016f393cb18f58d4 SHA-1: 4198ff387bff41b567789dc6dae4a2acab3ac20d SHA-256: fdcceb5b2af55495c1bf907738b27a05018da2efd9d5aae56b37901d347083b5
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites, a common tactic for SEO poisoning or distributing malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7284

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://accidentmatters.com/ckfinder/userfiles/files/68087948116.pdf In PDF document text
    • http://phayaotechno.com/UserFiles/File/xujenogikipifubojugezaja.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160beda83e3b0e---savodunapilat.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/45662046357.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/53732071174.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/47017384641.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6e9e761---57157502352.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/99fbae2c4644b5cfe92ed5f6d7214bf0/73968853047.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rewegogurivepujifeginivol.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/ruvuxemos.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/47840501025.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/60932725727.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wideriminifav.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0337e7b6034ec019b82cc28ccdbfbf53/19428739770.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/21654656166.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e68b482b---2848654365.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/pidagogadaxutema.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/26889150437.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4e976e2a---tolala.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/vibukebolof.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fa304237---faxiz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160757933b3357---fonaxusazosov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+and+physiology+terminology+prefixesPDF link annotation
    • 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_off000191c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C3 11144 bytes
SHA-256: 1b4e8ba0859d24ced5c7915a24040da9be1af8a6f505733850a5255887c75325

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