Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b3843385912f1d…

MALICIOUS

PDF

69.4 KB Created: 2021-05-27 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a523b81301f3130176d8cc0c783505 SHA-1: 35d5f556df522bee504db4e5877f3c4662a3d96f SHA-256: 80b3843385912f1d13b1e25bc3423ee7dd457b345ca3d78e7223b6322ef1c704
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'quadratic equations', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e790d907c---94363719787.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec3eb12023f6f312038ee00740299b87/satoruwebaverafitem.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61c2c0fc1---63742180242.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3f5d6ddf---dizefulexebapil.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8ffeebd1a32d1bb5ebf77c9da447ae09/4600523014.pdf
    • http://eprdel.cz/userfiles/file/9233464997.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5560f1e12476f060bb5585a7debe1a43/rodoxuti.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3114311fd2---31778454849.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/523baeab4f7b46dd2d98bd2ebc445405/40791155396.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff18e3cc3d---zaziwalezetutisusenolape.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a64e73e6055bd3e3d5c8e119c2233f71/kutaxaw.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34321182509.pdf
    • https://adasms.fr/userfiles/file/74655167529.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712b7b0681b---jedojobomumelaka.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/55bccadc445fef8f0a1780f725da6239/90264145471.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c79b80530596625343f57dee63f87086/47080835013.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quadratische+gleichungen+l%25C3%25B6sen+aufgaben+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd29.bin
3d880c863c6751247c3f6946a703e4f5f8ef8379cc195f42bf80fe45626a2e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 5756 bytes
font_01_sfnt_off0000f07a.bin
0d198c54bf39160f5cac4d4e06ffa2578b4431c6f5a140726a03c214ef84b40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 11716 bytes

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