Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a873f2a0788ca…

MALICIOUS

PDF

60.2 KB Created: 2021-05-19 14:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c3a36412e489364879357358ba1575 SHA-1: 92d045e396d943502bb7588788fd0d1d0a906c81 SHA-256: 819a873f2a0788cacaa63bc9d8d4a7aaa6c265e96b180aa83b1b12b0e970d15f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, likely serving as a link farm to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e72337783---fapilafosoremerenazav.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a48f7b377---18609972281.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4228a57202---35074959156.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db0da309ad7713fef8c74de6cf4da8b4/xirosewuka.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ebe40bc1---20707223113.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5vi3scog3l327do0fjf2h1cm8f/78618800616.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea9405b1f9---gemivatupena.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8e2d22b18463646011aac411d9a81f63/89051083672.pdf
    • http://nowyhotelik.pl/userfiles/file/gifazolazadoratozut.pdf
    • http://smflow.in/admin/uploads/file/pujawenazudawemuvono.pdf
    • http://kartywspomnien.pl/uploads/assets/file/61923576648.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6d4b975a4a0e70d0d959777c693df8d1/81121811852.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06eb6aaa6a---85708510003.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3f4e6656691b5d98f0ab13917875bbee/manaxeduzijuku.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1176bd30b---lerusodejuvawaguna.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9aca0c7b---lapurawunoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can%2527t+connect+to+peers+utorrent
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db10.bin
47978c413b2eae3c1af328f46cd4831a9d666cad3cd5bba85464f645f1eb8f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 4832 bytes

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