Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd933a81fbb6030a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 09:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8a04b2ada6de14e9ca642f118fb702b SHA-1: cf8aaaa04ae0a5b4497f62b12d5b44f7b351aa9b SHA-256: bd933a81fbb6030abd03489976b8fa35c35774d4754ec8690b86e8d3777cd0d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were explicitly extracted, the overall structure and heuristic firings point towards exploitation for client execution, likely via embedded malicious content or a drive-by download facilitated by the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://smidgel.ru/uplcv?utm_term=malayalam+movie+download+apk+2019 PDF link annotation
    • https://mlmrockstars.com/ckfinder/userfiles/files/58388795126.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/vutiv.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/71714946126.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/16694884605.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wowosujalumil.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136579e8ed80---ferowozisabibokefowu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d0068511c---83072465533.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0hcivn98q0q90e0io40pdoa4s6/88755362173.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109010837582123.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/mijuwizawaseliled.pdfIn PDF document text
    • http://deauville.ru/files/file/30681031545.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kujajutog.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6c3d587583f059da2b6d8c9231a16a8f/63747816599.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/30161305874.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/fulupapikepumu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jigelojag.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/povegebojezezixujebixixiw.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/99648423979.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/47572082795.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/80522000294.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94faa5aa1---33344283077.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/sopugef.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/dedonopaku.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41704334647.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rofojifozifizip.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/5219445569.pdfIn PDF document text
    • 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 11000 bytes
SHA-256: d7208e6b5c1dee465f87d438cc185bd956f25d76fcbd284472d74be10dae9264
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 17800 bytes
SHA-256: bf5cff1e072a0c88fb4891f4dd469c8799ea6489aa593703016c9a0a174e5d62

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