Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7418889bb921c7a…

MALICIOUS

PDF

62.5 KB Created: 2021-06-20 23:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9472c8d18a6d7c4eea1195b7b2a5a004 SHA-1: 79656a25726eea14eb29ece64fe3a73c0a88f011 SHA-256: e7418889bb921c7ae61be3decc281d45498c42484204751dece2667398eaea47
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, likely serving as a lure for users seeking 'syllable stress exercises'. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7500

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://queure.ru/uplcv?utm_term=syllable+stress+exercises+pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e524f8ae---pemufilogodomujudesirojiv.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/22e74cf32e933bf8958c3b0740d86b7e/7406845690.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n04t2bcedcbt9dij2r6u42m3eh/kebutokizonotesa.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/danekiv.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f703666f1d---53754538332.pdf
    • http://atsrealtyvietnam.com/upload/files/7351153923.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1342e58f---52594951416.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/62esq9bacbs52f80c6r14mbjum/xufiwulavekemedega.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a5ec6f71972a9264b6e1091bbbf58885/44028891133.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee4247d99---difaditivovanawedetu.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/73134912610.pdf
    • http://work4shop.cz/userfiles/file/31429001937.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/o02qgjlffufk32v9vgfbq29fkd/79237995149.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7qhc72atbpo4r95noauj0e824/sirami.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_off0000d56e.bin
e1f28d915b1732b2834190a0cca2a669170482986aba1eff3da2d8a028312ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 5560 bytes

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