Malicious PDF — malware analysis report

Static analysis result for SHA-256 86680727f07756cd…

MALICIOUS

PDF

66.7 KB Created: 2021-05-10 00:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec2e44b34ac8d4a1b3a236e4b70dd0a SHA-1: 850726dd97200aadefe0e3260f5a9883f911a3a2 SHA-256: 86680727f07756cd5fb5791600f9ee21a3a5910f6f1cd6081dec4c8c003faf9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links suggests a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca566bf5c5---fuwisugan.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/971e42abe5ff4a68060e1fa3df87112a/69493075429.pdf
    • http://xboxheerlen.nl/userfiles/file/14771902598.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2c4b5dcf109a6024f190057540ef44c0/kikukaxan.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e342c50468---53193838353.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607353c7e114a---tixuwetanewuzap.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d9b1c3529c207d2d957aad8593c89cc8/bokunopaxomefexef.pdf
    • http://originalcheck.it/public/img_admin/file/%5C/16912068431.pdf
    • https://a2designbg.com/userfiles/file/xafepiwavedozabekepas.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a603adf43---29546979344.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f165a72ec1---90163940288.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/98e3d5cb6598dda1d48857685489ff5b/3544156243.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa745589a---juruvulirenukeru.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c4ad8bac---53129674630.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d8fe2adabd5ed88a7ade45254f6b5315/93880880432.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1c3cbaa18907dd4b1add5039828c29c1/biduwebepefuregijun.pdf
    • http://aarogyamedico.com/userfiles/file/34554481117.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cec218c0f2a47005e945da95bc4e8f03/nuzekakir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aac+adts+file+format
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e839.bin
1dbb54731f0c59566f5a026d336e20efbea997fae028703929aaac3c074132fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 5156 bytes

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