Malicious PDF — malware analysis report

Static analysis result for SHA-256 88476b0046151533…

MALICIOUS

PDF

70.3 KB Created: 2021-05-23 12:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5754eea5879994667217c062a6a12d8 SHA-1: f95980a510ad002ccc72a2c0fdf26d8411d9f878 SHA-256: 88476b00461515335c686737965ce21bfba35e9e5383170743910a40ab0d6a8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The primary attack pattern involves luring users through a seemingly innocuous document to potentially malicious downloads hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/loh1ektp7vctrgr7rcjhgm10oe/zapulejakomijuxenaxituw.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0df35480f---41839884912.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17eaa6b023---mokoza.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9a1c1e52---masetisopox.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/58105838877.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3215c7bfc---zasivexopelozaxefuwifemiw.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738aca13271---34980389530.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec72d36b6---90545935827.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bp3u9j011upqm4p3hl58uq520o/86882061552.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837be8b9caf---vexabe.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85b3d19d5---55531960725.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794452e888b---rakafexopipudejowuzotanev.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b247014a72---72570841496.pdf
    • https://kermoulin.com/userfiles/file/jatugamibasikeroka.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ae93fa61b2fe9bdd44aa7a82406d20b/pefiposulotowilesog.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/81793385d1750bdd5537e5cd1fe9a6cd/85737117250.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-13/20210513132144417520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=konar+tamil+guide+for+class+7+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcb.bin
e09d64ee4103088ea43b86d5f97e4499a5cd1264997728470947f68541832e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5524 bytes

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