Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c18782d493bbb5e…

MALICIOUS

PDF

62.5 KB Created: 2021-05-12 16:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3bff10fec9b0dd62a0d10631515ecd SHA-1: 8799d22f395884844cb8eb76fcb8183959b96f1c SHA-256: 7c18782d493bbb5efa4743c8393bb6ab7557c35f48dd39b089fece7119b1757c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

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://accomplishtheimpossible.com/userfiles_ati/file/fosexoxusawot.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/21bf77acd9f4e477637f96e127097533/37548589834.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ae5c9c1093368b6d3e56c64d2a0e04ae/87286948316.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d2uordivtic4h3lo08mu3i0d77/64683573194.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cec658c31e74e29d51a3d6e29e22c3f8/73052421005.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/978943a4d485ec7a33b5e67952c0962c/sukazebewojod.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fe4ab5f2e5decb88d91a2a2219709cef/sefatemeref.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64219f527---zuzifovewezid.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/vunadujatonimaselujetew.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/49d98adc85dd74309cea7672d06dbd2a/99909923813.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/julejowikogagamesaj.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb7eea861---47032217671.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc1fadde95f28ebd356a677e66d6ed9/bawobe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27dd5422e---37806168240.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9b029f59---bowoketoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=auto+manual+voucher+numbering+in+tally
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc0.bin
1956a633b6e2bdc78ea9cef0cb6cd19fe4cff2f8c310f4a08d7670aa8e1035f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 5208 bytes

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