Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a07723c7c092ba…

MALICIOUS

PDF

54.2 KB Created: 2021-05-29 01:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e78db34cc6c94808ed643cb926a44c4 SHA-1: 743796f5ebf3732a74fb08c4b0842c6478eef2a8 SHA-256: a4a07723c7c092ba5bbe3fe1487e5fa5009feb9a9eb4acb525349b7f55b6b08e
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to potentially compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it may be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9442

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6f282c362---99118944697.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/bae2e7aeb42963888cec0e75fc6b12c6/40295757878.pdf
    • http://splogservice.ru/content/file/39099626252.pdf
    • http://timandlor.com/userfiles/file/jukabajekuvepufe.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e111b95c---gegejabapikim.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b45a0d4252879fc9d356abad9571a81c/xivusixesejutujuze.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af698425d---pugonadezuvo.pdf
    • https://palcev.ru/userfiles/file/30364594346.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/db51081670e7266c6d04075e25c51e42/88133645730.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de890610e1---45820315923.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5d4330c9---79714403004.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90cb6ea4aca1d0567c65552733f7b2c3/3284380482.pdf
    • http://taxicityplus.ru/userfiles/file/9908626520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+get+my+ge+washer+to+spin+only
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c158.bin
e14a6031d7d5037e1224c9f657656494e2fdc494a5f11488d0bdf34a521506c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC158 5528 bytes

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