Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eb6c57fe0501e1…

MALICIOUS

PDF

63.7 KB Created: 2021-05-02 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf15c35dedc7ea3aac1742b314388ae1 SHA-1: 1e1eb62ce9c1d77a6b8a0df9bc6347601e0eea1b SHA-256: 52eb6c57fe0501e175f54c3d08f2a9733dfd83143212b26c50cd496583221acc
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb648130d---tamelozurukinuzazodo.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e009212ddf07f77fc70a7a5dfb69dae1/86004127089.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607533f5a5d6f---fixavopivozogapabuwotadoj.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/601g6k8pbcifstssaa648d88r4/mileteri.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4r0kf996iisomp6f3v3auk3vmg/tumunerepovekegulamadafot.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08624a71f---nugamuloxudobuguzaj.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ab94453b---puwidotivunaduwikomolez.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/55c53449bba8a9ba14873b1d098557a2/kijunebivijekalatijov.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/fs63ih72gst3d58bud88t59p33/tozazimimurukufunoxo.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ba195b2d---gudojogojevi.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c211507313---25474469339.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a0fcd7252076acf610948a09fdfa97bc/pazozigixetewotasanepuka.pdf
    • http://anhbanglaw.com/userfiles/file/litunusuzatog.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ea428e830456b6a315bbe4719f045f33/bedakuratiwane.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160776ca78428e---tobupefaxerakivizif.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/44fcfa6caef614232ad8fc248a7fe4cc/bopax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=translate+french+to+english+pdf+document
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac7.bin
5fb848fe8d36ba444b81014589a9ee51473139597f6aafa216813fa04645b2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 5516 bytes

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