Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fe4b909a245076…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 19:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02c8cf9ef35031103269ad38bac5cb08 SHA-1: 9d76c2e92a3aec1f80252eaf16f61fa94c2d0777 SHA-256: 61fe4b909a245076dabf35fc4a2f223b28be6852b45d0a7805ba137e2f9bc50d
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

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 http://watthaistuttgart.de/userfiles/file/zalojosuwaraxuv.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612947fd06bff---tawuvenevigakivemikaliwu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/21005178723.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/levefolelebov.pdfIn PDF document text
    • https://t2sc.me/userfiles/96318666414.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/90193550990.pdfIn PDF document text
    • https://emenu.hu/editor_up/resenukakajegojatupa.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/depivelegilem.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607775cc2bdbe---teximimulizexomoxuben.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0892a032b6---30354335052.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/h0vc4m5gcerc41ea865dnp39f4/wunokuzikoredurabe.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/fidarolobi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9e77ab7a581a037be9b68e1e0c95b609/72939307788.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/54337801883.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/zuxasiwifezo.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/46822799968.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a88d7ead4097e7cfb2685dc16a96aa10/37726160697.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/fadenerexiga.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210815_110148.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/58693965824.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/86991060030.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/965bbc6b50f31d004c7553ff567f2b1f/metekibuso.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7goqiqjnts8adhdgaubrusm6fk/tegomijatebol.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151585277161.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/paxepijuwamoxemubupiz.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/dotav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=saver+reposter+for+instagramPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 19008 bytes
SHA-256: 8fc6c28d7717d22bc291072d818a43a03bb68e5ee0dd41ae511b41c9d9887418
font_01_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1