Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2708e8f1f13a02f…

MALICIOUS

PDF

59.1 KB Created: 2021-09-26 09:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c190e59e5d415a8624a8bdca50e8aeb8 SHA-1: d307ee94e4ed572ab666bebc6422b52f43739cf7 SHA-256: b2708e8f1f13a02f3381ba87f490972c6c765f4b70e01e87b98ec25195189109
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6632

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://ubestsports.com/imager/files/20210910190856.pdf In PDF document text
    • http://vitccorp.com/uploads/userfiles/file/12070777419.pdfIn PDF document text
    • http://stringladies.cz/userfiles/ginujejonerovilir.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/72874609502.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/fimufumidexok.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614de459ba133---73557187243.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/superinafikuguvedidovim.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/bedefiwusogizokonegebabov.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/3338306773.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/33245552353.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/72057579174.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b03c21dd---54230925193.pdfIn PDF document text
    • http://yuli-china.ru/d/files/bivegumumomigawujem.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/jimelawuwisetujol.pdfIn PDF document text
    • http://scsychem.com/upload/files/pikepa.pdfIn PDF document text
    • http://villkasz.hu/editor_up/95392325819.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bd5c926f1e09bbe6ff5dc5fce06a00d7/wimakizibil.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sasuwovenidogikamuxesaka.pdfIn PDF document text
    • http://fabtur.ru/upload/files/suzuwiwevefu.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/poloxemiweb.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/sovefowozeparovutujev.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/78e0f9cd3ac9acb99a4b8064ce2c0021/75847942254.pdfIn PDF document text
    • http://epplast.com/files/file/26970889134.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/75960003041.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/janituwatewo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/vokiniwefexagovixobawipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=life%27s+little+instruction+book+pdfPDF 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_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 16524 bytes
SHA-256: f6ccf981a29ae57c5cca65ec1d547b92bd6a8e327b252f1a8ba56ba0a72de269