Malicious PDF — malware analysis report

Static analysis result for SHA-256 544916f4c4ff6945…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9383df2b2ee2f5981c268d985fcee5cd SHA-1: b19a769850d97074be2d29d7b5e8df2d7344ef15 SHA-256: 544916f4c4ff6945bec9e7f070b57e8f4e423590776991b3eaab90b644670c64
154 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8185

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vokalensemble-vocembalo.ch/userfiles/file/7541338618.pdf In PDF document text
    • https://nhanloc.net/userfiles/file/90002966379.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4d854fb8---90137128867.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/bururisifozigetimo.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/bigewefo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/reruvinimonipawe.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/23214037057.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/14551114825.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/20122057467.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/wogodinukuloruxodijuti.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/xepuv.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d8cf0ebc---xivotesulinufuxer.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/22392878610.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/vozobonugi.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/7984179864.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3400eb51---87823954344.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/belupidiwagadukuxatepeg.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xemibegitikazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+hotspot+connected+no+internetPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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