Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdc0591365ffae6…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 03:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f85228d469789a3da62f922774311ac7 SHA-1: 0f1efcad192f99eab88251fe069c451f56c83cd3 SHA-256: 6bdc0591365ffae6965c4baf50893c3c3e8695c635948b1121c02679ff9a9646
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's likely a phishing or malware distribution lure, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

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://fobas.cz/userfiles/file/4220411280.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/53387126108.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/28b55f3e97998c0be7ca528f1c00b759/dawulipal.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210703153559.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba30cce71b---24167536473.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/23248955431.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a528e0af8---87692656870.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/sawuzovugivobete.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504201221716.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1453373800---jetebirubukirabanerotena.pdfIn PDF document text
    • https://onwater.my/uploads/file/biwiriputen.pdfIn PDF document text
    • https://egca.fr/userfiles/file/safomavamabitezimalun.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1385174945---pufem.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/leleranofuzavaxikulowaxu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6e7hkbu9v9b3rdg7jbpictcfi4/duwulitemunipakip.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3d3beec41dc5e1216f5d435706e62c4b/37584967270.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/gitizuk.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a756f8e5cdd94c05af313ae98f33429a/91342036875.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/80736154c8a3acf65fa12e7e597094b3/3748106941.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/84fdc7395b418863c288b17bfab7a394/32213605664.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/45849318645.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/48926186478.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/5233010031.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/dabekikorejojoxisesoxof.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/55852899445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2015+raptor+700+service+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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 11080 bytes
SHA-256: 03e06cc1d7916b93c94976f72435150c9fd538a9e825c4d70e3b34995f96000b