Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5e566b0cf08282…

MALICIOUS

PDF

85.9 KB Created: 2021-06-16 05:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df84fb8f6977ed0d1a11223a7e29caa SHA-1: 213892deadc7e770d393e94a84f6fb8b6c2e38e9 SHA-256: 2c5e566b0cf082829545111367efc7856d2b6ba89aaa103ebdc10266c4c38978
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9576

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://krisoc.ru/uplcv?utm_term=sama+lamaa+duma+lamaa
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15337e30b---kelififinipowofidoj.pdf
    • http://machinegroup.ru/img/outer/files/59421068705.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dff6de5ef---95178741388.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608653c8242c9---lepuvoxilonevoj.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c5d50ce19132e5ff77635fd303708e0/febapejoziko.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be66a157c95---menurumegobij.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5a87a6b8560de97e18383baff93f6f7e/moxakos.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bafmqpg88fde7rk6m8fgg9hksh/25250733325.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608147de25273---tefukanavugemazofa.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e3fe6ee972feb507af908335102f3c12/gonepemabijewesiz.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078955008f89---xijiju.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe6af54651f10d7571276f01d3f60e27/58784003556.pdf
    • https://decoveinvestment.com/userfiles/file/zanufuloxujexevivizufin.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3fccb2df2ba66ac206354c08568b3cbd/jilubedobijugasopopabogip.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jctj5hdi2gokr9ihqo9fes4hpn/josiwagosonu.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b373a3376---ronulanunak.pdf
    • http://divorce-difficile.fr/userfiles/file/21626687578.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_off0001237d.bin
b6119dca95caf6e0f6c0ed379a5cb13098652cb2f7b444b4e66c1a0cef05546d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 4800 bytes

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