Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea732bbb54ab9f12…

MALICIOUS

PDF

63.4 KB Created: 2021-05-16 23:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78878c92320dde64143750e87bf606e7 SHA-1: 87949cfa28df4d08ec8199782ad0a8a11cb2a5ac SHA-256: ea732bbb54ab9f128b4bf199379f35733944df4bdb3373a67aebb6dd6f35632b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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 https://irlanc.ru/uplcv?utm_term=canasta+card+game++for+pc
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160944b25137d5---savesakuzukega.pdf
    • http://www.biotanika.pl/upload/file/19903486119.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160926d2628ee4---reriribem.pdf
    • https://alutat.com/data/file/midul.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9d9b0d6af94357ff6242c363c382a15c/81694426410.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7a51160e---futoxawuxovufazipirape.pdf
    • http://aeronautike.com/userfiles/file/7514933848.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db02aeb9df---zovaxiw.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266bbab224---gogekasuvokasimenanetum.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77c1d0d0e---riruteziduvatanaxega.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c4b854cb---62061987745.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608420e9273a5---bisusenatijejufalizu.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/60f8625cf61894d6ae999e826ca94e83/15813185548.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b66e7353e---30655689378.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3de84499c---84853334697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
c89771ba14a189bc2c70d6bf797777f79e23334141d901747937aae4d6b08135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 5208 bytes

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