Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e47a26d182b477…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 23:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c338bf3518bdb642deb2864349c1548 SHA-1: 79e7e218b92673a0c96c9d8064071030752bcf79 SHA-256: f4e47a26d182b4770235903432d38f0128fb0260dbb46c49a2acb187d1ac6f9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a lure document.

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://everestlodgelukla.com/userfiles/file/37620934763.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/16593801422.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4f906694f1ed4f5d0bc177ab3f8e5ce2/36261028386.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/69252305528.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/33938133135.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/54417974833.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nalidovaxukujabet.pdfIn PDF document text
    • http://imbirimbir.ru/files/54733707096.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dorodama.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/kokipetifo.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/xedesizijebuxa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa9033d0---mubiferudipaxifovedol.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8aa72ac4---pegekavenubiw.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/wupoxotuzixabevofab.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/16161021854.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/pobita.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/bevuvekibuforanadadupoba.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///morolenelagupadumowipaju.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/72883277757.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/pudor.pdfIn PDF document text
    • http://getem.eu/files/file/vuweko.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/17335969299.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/fuzulafebef.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/68503812272.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/37853036486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+fortnite+christmas+skinsPDF 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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 10700 bytes
SHA-256: 02c4653a1071931c14b2f8a74f859b05d07ef221592a081064f2caf208b5fa2c
font_01_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 17676 bytes
SHA-256: f250a0a0fbe76b80a7cc7c3e9fd5c1b9784b515cd5b74ed03e4d693a7cb9c363
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1