Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcad43bf067d9bcb…

MALICIOUS

PDF

79.3 KB Created: 2021-08-29 10:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2310161b48feb16e2b7e0fb65a0e8a25 SHA-1: 4f32340da913a591a0b5eeda1b2e996b890a60d8 SHA-256: dcad43bf067d9bcb67ed6a16d83029c77d633b46dcdc78cdba2dc2433448fda3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2310281191---70147611876.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32a8452dd---pijida.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e41a645b4---mogonitokerubazudud.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/zenoguluzesasibugilisuziw.pdfIn PDF document text
    • http://npas.ru/pic/file/75635495998.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/makugiwunalog.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/49528718048.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/95651399717.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d6be9029527---numewutomiwa.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d402ea2345---satowegozapakadopubepoge.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/95207224762.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dukovinibi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097975c63f9b---bokufijipapidivorin.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/ratuketetuvumomif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f81ec461d---visaf.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hd6sboq1j583kopg5s4lpov478/nufufezataronelesavozig.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/duvexesaxopapuvex.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/danejolekudisanatirajuko.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/dddc51ec7e8010b649a6fb91a1b64bb8/tonenobisaja.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/55175923498.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a508aa896---tenovetaxanilutoxuzivuta.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8c3a4b76849cb8d87009858fa2b52065/gogamotefuru.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27890a50e5---30625044736.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098330604610---lazusajumimamevo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/45816072906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=one+piece+anime+episode+1PDF 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_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 10508 bytes
SHA-256: d8f8c95060f73bdb7a1a33d828524d3f529995a1e1a636029cbf2668dba9846e
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 17964 bytes
SHA-256: 96693760fd391b87db3d745bc0a96fca38dc2c579ad04a727475dff1e62b8594
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1