Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5bece79f9aaaa2…

MALICIOUS

PDF

80.0 KB Created: 2021-08-14 22:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1f8d5cd6e8f17d0f306c72b7acefeea SHA-1: 66d255041891d4019c82254ea76ca19b9a5b706f SHA-256: dc5bece79f9aaaa2f0e538bc914a7c4e4b6c51a4b14c2d4b6050b9a36d0bb06c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=xamarin+mobile+application+development+pdf PDF link annotation
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9e607e1a0a1bacf98fea428738432627/darinakererali.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kfkc0357nae1rbpla0rcep3tt7/sipaxakujaribolexedoner.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/aa9fd1438ad084eb0f97b66f5654cf20/vudifibuletamurotu.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/wibemegav.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/70528779799.pdfIn PDF document text
    • https://fotovipvercelli.it/file/37496645147.pdfIn PDF document text
    • https://vleek.com/uploads/files/geribofa.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/46981336662.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/79239881086.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/7751490888.pdfIn PDF document text
    • http://gibisch.biz/files/files/najurasaku.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/61878851407.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b60640e7031f210d233403ed70382da0/leminakitak.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2e89a96ad6ca6e7b49d505223553e1/mefabigokogagetivekavu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6e42340b63c188ccb2f3e7ab94ce5592/48024312366.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lapasur.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/25050942233.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/lovekagitoloradewotu.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/mirow.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815e788b640---pipuxutebugufovedad.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/mitoxurasuwigaz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ae13dd745---8580675095.pdfIn PDF document text
    • 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_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 17564 bytes
SHA-256: 8bb6837c263003dff4d5d7fd7eda4e09a5ac3ef29a9c83eccf5ba167aca0004d

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