Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4701119acb4fb11…

MALICIOUS

PDF

88.9 KB Created: 2021-07-09 09:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3d9f9320cf66cb29b22d66bb7c882a3d SHA-1: a8c5fc463b9c37ab782114de4fa7d56f52f3f7d5 SHA-256: b4701119acb4fb115c244b5b2d5905e3907bb39ad107e8b53bf0bce93ecad879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609263223ab0f---89881003922.pdf In PDF document text
    • http://lafayetteconnections.com/clients/52818/File/83510498328.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jerapegexo.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/pejimadususelakifevu.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/wifese.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b5tvm63jujhi918ct40ai7cob6/70258241778.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/zegewebazeradukurubifelij.pdfIn PDF document text
    • http://bscartridge.com/pic/ludiwavuzajavaxujezuvik.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855222ed06b---jadikanoluzofumulaxifakov.pdfIn PDF document text
    • http://learningkey.org/userfiles/tibenujeke.pdfIn PDF document text
    • http://surtek.biz/image/files/20150118_203528.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/06a296109b194dc2cf55932dec34a490/zetabuvamefap.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7faf0111a---83958156606.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/nimaxediwim.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cf07d350ee6b400ce1c085a59a6853a2/nuwakexusuvedopawixaso.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d153f63e7a---nokutuvupinetij.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/79563307702.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d4f45b89---putazaxefo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/sebixewosidorerari.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/62600125264.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c6bfd6125ef48b57abd8c614e1134156/xelabilebunif.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/30433926711.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfda12668---xorifexerofidafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=insurrection+peter+rollinsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 19488 bytes
SHA-256: bd132eff2159d2e1005979dc025c3feaf92c269abb69cc4d75c6ef38efe1b977
font_01_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 10256 bytes
SHA-256: b4090c69013715f9bf10479cacab1d25d2f801d84996aad357d4c2a95aafa223
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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