Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaeb6c1cf751149d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-19 19:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 16494360e5448671620913a202afcce4 SHA-1: 901e9df0115b218b36431cee1ecacb852107a163 SHA-256: aaeb6c1cf751149de521cede852580ea5286ff0d3c8719d27b452b06a6de874e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, redirecting users to multiple compromised WordPress upload storage locations. The presence of embedded URLs and the nature of the heuristics suggest it is likely used for phishing or distributing further malware, potentially via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73404e2174---97785707258.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/deced80t0lq6024bohcj30a7s0/xijorulivapulegosifi.pdfIn PDF document text
    • http://funperm.ru/content/file/73469110106.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e772d20e6b076faa49e953945b47a539/57273554474.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/dulixodasibol.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/bofujisodixo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/cjrjf4kmi7fu91li7jh32bg980/xaxodiraguzinetumorodosek.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/ramejoluroroluf.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gchbekr2v5k0bls00csbl95dnv/ragimakisafanatejok.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aqdako5p1iii1s2dh5erikjb91/kujofi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c0a6d2f09---15906201497.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/kuririnidakawani.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/726af3a8ad745507a953a589665d1ea5/xukudekut.pdfIn PDF document text
    • https://bonacorsi.it/file/60164902638.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083600f622e4---32179232677.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rotezozujifaxiwulinu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f56a0d7---natovovi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76ce1b0287b2e4dd334006ef3aa61193/pixajasutut.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/xarakarejarolupanexuj.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3f8bb80b---62703328199.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df811c9e775---porezugusotinoxive.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b412996e3f2---lerexa.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/19847835701.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/zakeziditin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hypnic+jerks+while+wide+awakePDF 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_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16832 bytes
SHA-256: b8c9f8b489a4205d2419b2765df0118a76b63220905944c41207fce19a18d23a
font_01_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 10808 bytes
SHA-256: eceb4a2e208b89f0fc4949fe0e3e14fd6be7ca7585539a965393e469b9f2bf57