Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae92b8af2e5ff91…

MALICIOUS

PDF

82.6 KB Created: 2021-07-06 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0b343e8f6670e6f393e1193ee8b4b333 SHA-1: d8f45eadcba8521a16eaadf98f7a0910318f5b94 SHA-256: 5ae92b8af2e5ff91db7692fb5e37da5147701c38327ef4b1d7e4e929c40bc535
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of a 'download button' heuristic further supports a deceptive user interaction workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05ca05d3dc---33865743411.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080adc9655cd---kezerojum.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/af6a4e7aaeb4b8db3d3d15ebdde01731/84827477446.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/8480786522.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/83954126331.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67811609566.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/dinobixulojinegatejexelu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d56a89de86eab503afe55b90755fd72d/46555400449.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/99030327091.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/23182043255.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c04de9fe---pewiniboxu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/50983927021.pdfIn PDF document text
    • http://emeat.ru/var/files/rikisejewewenisatabi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb18e1e94---25462459354.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae356b4e2---59160254410.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/01e91de88930d8a56cb292ddcea0dbe2/79814668346.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/39b169a1cf52453f8111f240caaab735/vegosizifel.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b8892fe---22773311470.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/71689864847.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a1b6f5876997888bc89dd99985a8ac/vitobosasisunonanuxas.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4900f5195733f672e9bff81082495844/6625463522.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobuxuzinoxonifino.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef4126d277---92380954965.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eccb4ca79---72226037185.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac273b6f0d7---wanivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fa1+exam+papersPDF 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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 10084 bytes
SHA-256: 5669a34db600aa90a105bad88eabeed07ba52f5d31674336744536b573df5ffe
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 16984 bytes
SHA-256: 55934f3bb30c0487f093817cea786a9e5b69424d89bef610017589260cfd1017

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