Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c2d54be3f9a8f0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 05:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0a554abc72020dd56c779b616422fad SHA-1: 5971427d4b762736142130c33c0c270bc10025c4 SHA-256: d9c2d54be3f9a8f0aaa37e48a53c50ea82a18ca94aa7775fa08afbd7d54ea69c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and numerous external links point towards a multi-stage attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d7d07d29---ralol.pdf In PDF document text
    • http://arisutour.com/ckupload/files/bidisuzolulaf.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sororekijul.pdfIn PDF document text
    • http://rld-carbon.com/file/nepilexoxukuborakipa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/80af39d2b0930805d9769c2aacd9019b/49834007748.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/16e208734e7e8f7f2dd447e4bc36bdba/kejakikodefove.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/residenisok.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/biwalelofufanemososel.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/binilojura.pdfIn PDF document text
    • http://inercial.es/uploads/files/mopax.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf1605fb56---51083949102.pdfIn PDF document text
    • http://siembra.me/uploads/files/fikal.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/lutowasukomox.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/pezuwezevavosikupurikun.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d9c6ea83---nubemelosanek.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t39tcj104obl4uuduop82r9l3n/niwirurosadaperimasa.pdfIn PDF document text
    • https://gangnampools.com/contents//files/9573428823.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/57830104470.pdfIn PDF document text
    • http://vswet.ru/f/wumugibadimefos.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/27163556259.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc7b7bb697---wigoweweb.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/muruka.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161256f15f1b74---96354311972.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b4310e8de9a5bb5a8cf0b1cb891f40b8/18481761669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rhapsody+in+blue+george+gershwin+pdfPDF 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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 16816 bytes
SHA-256: f1c6b1d36eb8e5c6a244e54587e852892d1d17a89c76c98aa4d69faadac2ad63
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 11164 bytes
SHA-256: f48665c46fab3cfc1471825dbfff0fb43a7c975811c1a8b42b28ffeaae4c95bc
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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