Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68de2bd966dfe2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 02:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19b46a4549c47c19c6f2ba2165654428 SHA-1: 865c3d0f404fef7b197fc3abc36747eec4d6e364 SHA-256: 9b68de2bd966dfe23416e87d0f96a6b11d35c09d3b86b4cbd7feb96d86e7bb9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44583068077.pdf In PDF document text
    • http://mudrberanova.cz/userfiles/file/jalubiweruzejik.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/donozudinegit.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vopizelap.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cba8c69d5959b7e833a0126a68fa63a7/sinuselewajokawapowow.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pifetesoj.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gujonupedabebaxari.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/rebifovagewa.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/dimisoneveguma.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/siluwixolibexepo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/3627448652.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/vuwinamubodumoveruwobaw.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195235584986.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/49486995014.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/mepisi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613503fc7e5e1---95310107547.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/96546209911.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210912080634.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/32131491935.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6b09014e---lawogiwaratirajaviledodej.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/mibofuzituluravofuxe.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/79844953393.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/getadomapanipamepur.pdfIn PDF document text
    • http://hybsch.it/upload/file/wumesokivoriziduti.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/rovilimumaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cx+file+explorer+androidPDF 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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16856 bytes
SHA-256: da75982eb1af9a5880955caf46cf11180ce9173c5f10ab74491e795e1862ea33
font_02_sfnt_off00012f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 10360 bytes
SHA-256: 627ca4ab23aa8905e6355d7028517969dc238cea00b33120ad5d7b8eb085563e

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