Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3077274452de5d…

MALICIOUS

PDF

68.2 KB Created: 2021-06-08 19:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 400955a684803f9cf07f897d9a708b04 SHA-1: cdce0e623ef4d07329a38aebc4cce0dd13b1827a SHA-256: 3c3077274452de5dfaf26bb7732db50c05f340b83b8c55c69c88f3c71e56e52b
154 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The document body, though heavily obfuscated, contains keywords related to 'apk' and 'photo effect', suggesting a lure for users seeking software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9722

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://cructi.ru/uplcv?utm_term=cartoon+photo+effect+apk
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec1c594a7---14300231115.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/932dc52b0c6dd77ee0c44cf8f8ff5487/zopugutawabemilezu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a784fab49ae---66049335143.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/bjuktb93f00i4g5hnosph0a9p3/wilixevebuvifovirekoleri.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/t5nkt8n38fsvrebo2ebd4b10b8/4720254028.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e3eb41c80a1fd1d6e3f54703519f7072/kosavezobukubadal.pdf
    • http://swaminarayangm.org/userfiles/file/57568520923.pdf
    • http://jncs.kr/page_data/file/20210518053141.pdf
    • http://bigsvatcharasith.com/userfiles/file/nepefuxaj.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd88c66ddf---86552728797.pdf
    • http://geose.ru/userfiles/file/kudajapiwaxuk.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4648eab0f---39880125608.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e7d7bd6f---rozasumo.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8fb85faa---jugizediribepim.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa12104b36---kazubugobizofofo.pdf
    • https://a2designbg.com/userfiles/file/zubakemirised.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds5uc7o1kffb767q6ddj5gpppr/10540630401.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_off0000f020.bin
eb24cf7e07ba39592176fa5f941fee0153c7f596a5e60e295254e7439f3f4d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 4864 bytes

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