Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66190eaf769fe21…

MALICIOUS

PDF

68.0 KB Created: 2021-05-25 02:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a84052f9e86a29572eacc046359740 SHA-1: ab443cb057dd9710bacc4f0b5c8d9c1436296345 SHA-256: a66190eaf769fe2121eedf42c01cc5ad353f65177525580d59cdbc867bbb5a72
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware or lead users to phishing pages. The document body, though heavily obfuscated, contains keywords related to game mods, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7649

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073513bca535---wovisewera.pdf
    • https://bem-sa.com/img/file/66218406841.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/fdfb47f910d6b0173c70f4c8f59caad1/gezibo.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebded2e621cdc14dbc4534fb70cdfa6e/46609972055.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/401e9503ccac676d60c37ad179ed505a/bovogodewelunu.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6c94d10e---47032766762.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e59fc2f0d---64167795461.pdf
    • http://abnicum.com/files/file/xinegilaxezutafudulepi.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/cb5e8e42d670da15247e90a8e766ea01/12778349703.pdf
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_111923_157.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71a601dcf---56636025517.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l7r8rrflikg6k5jerc6b95jcle/19163779787.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1477cb186c---tafexa.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982319e571f---91473414978.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+gearbox+car+parking+mod+apk+unlimited+money
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c9.bin
a805a994e61cacf05acf70643047ced35d63ba5595a223f32eff601360538189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 5596 bytes
font_01_sfnt_off0000eac9.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 1800 bytes

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