Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e594b37d138c6…

MALICIOUS

PDF

90.4 KB Created: 2021-07-21 23:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c5cddf61fb0040a95432f120953c7d2 SHA-1: 3104d8cefd67bd5e40d3c9504e2b9020894814f5 SHA-256: ae5e594b37d138c60a6b430fc5e4faa24a9d14feb009909dee6510c2d7bd2741
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The file contains numerous links, many hosted on compromised or disposable domains, which likely serve to redirect users to malicious content or download further stages. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/be62041b23e102c81ef025d630aba7ff/82950954807.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2d5f8839538ffd2bf31a39c0975f9f53/33503052511.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b78e9aa58c415203a5a876db53bd9d29/wekogonegesugujuzodemaw.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18300cb40---82059574266.pdf
    • http://sanruou.com/app/webroot/uploads/files/23842506493.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6df78408e59e530c602bd6c2dfac6e82/vigokawinor.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/xakegutopakivaxizinotagor.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/634bfdfacd551214e44e86ef32f3bfa1/mifuzux.pdf
    • https://mk-sito.it/uploads/file/sipupapil.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8u3vi1s9lokonjhkau137f5lbv/pufuva.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5d87f6ed---pufapugun.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1e14f260---wuzenafuruvanaxirinik.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fecd8b780---gikub.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8d80774e46c9326c13e57810fb1ecbf2/3445990916.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/49023479346.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90502e4859---42323210216.pdf
    • http://kruengrangthai.com/files/files/vixolowukivokokiwezi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a438bc4df74---78148562827.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/25da20facb9987751c7c17377db15937/52570802626.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2852a407792c42f092f60f1b47572d9a/7908062843.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4aa0fcbd2c90a590b69afcfcd7c8881/40163679127.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9be452c8a0---jogezegevejawozexusutew.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/budevokibuvovujedojedi.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f2217618---demuronogasa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=narasimha+karumanchi+data+structures+and+algorithms+made+easy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fe.bin
68fc76cae40fb9f4ecb784b6b6738b6b25405f55376f25235d33ab3f6e1e66eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 11352 bytes
font_01_sfnt_off00011062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16792 bytes
font_02_sfnt_off00012874.bin
7e9bae07c06a71344e7213df2d500a0862af1cd3662c262daaaf9f12d32b2083
pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 18924 bytes