Malicious PDF — malware analysis report

Static analysis result for SHA-256 9290e5cd7965ab76…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 22:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 614d8ee71f1869a3a1b5193704f05bb5 SHA-1: 4ddc3236abd75abd6dea59cea9500121f6eca9be SHA-256: 9290e5cd7965ab767c772f750b78a80da350b7083e8ffef3adef64d4f2ad92d4
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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://liniagdanskzydowo.pl/files/bigupapo.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/makixakokibagokiloko.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/2804595163.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160849869dc2d4---69770240039.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bifotuvogavetopi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/klj4g4c85kjh1nkhgm0hcpmif2/moxenokujumemu.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/pifawuvuludalaw.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/nevufi.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/girawotosebafon.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/wiveva.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jirololirapetafaromo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7163172594.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/58971058151.pdfIn PDF document text
    • http://kmsenior.org/file/files/midijutivadubug.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/71171282068.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629584564.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/narumufubib.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/20495497798.pdfIn PDF document text
    • https://anfauglir.com/images/file/tevefupul.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d19f11b2b---71335974871.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/21u8qsdu65a1mjt84sq29hakh1/murenonivaw.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210803162797215685.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///76860697305.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/imntpt9buv7q9kgd5d21ce5ams/ximoxajasalenibefuf.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/39460728194.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/32575432711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2012+honda+odyssey+navigation+manualPDF 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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1