Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde19e270add0116…

MALICIOUS

PDF

97.8 KB Created: 2021-09-20 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff08f550658eb0af32a6f8fa91cef713 SHA-1: 3326cb2fcd81e596582d93858a89a48bb21886bd SHA-256: bde19e270add011658c83c1c5cb1208d5826ceca034142c4d479a3e044a2f25f
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs social engineering tactics, specifically a 'Browser Install Lure' and a 'Download Button', to trick users into installing unwanted software or extensions. The presence of numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://multimetrics.com/ckfinder/userfiles/files/bonogagigopuv.pdf In PDF document text
    • http://cx-gl.hu/images/files/tojevikisurupojazimu.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/26972620077.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137432be99ce---54455264322.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/19403408284.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9276f00a---loselafosugepuzifuwisir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488a4562864---79831217141.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a906ec17a9---reluvojijebaporifujam.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/26699916763.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/44347536644.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/90886906955.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/buboponimejalipaluzame.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xopisowamorobulo.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/44096693230.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/dilavonela.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8581645f3---niminifobojobesejulimiv.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/58082276128.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/jadudineroneb.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/25877425233.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/11401084507.pdfIn PDF document text
    • http://baove24h.org/upload/files/wokivopagenugekipikufe.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/janaporapijojo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/76426643315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vidmate+hd+download+apk+old+versionPDF 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_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10868 bytes
SHA-256: dd6de412bbf2c4a89d5714c188dc1cfed39b0e51753c6500edb06271443da85d
font_01_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 22540 bytes
SHA-256: 1d11a13dc76c2cab196ee105f5af864aa42669be677b592c83291762854efecf

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