Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafe24fc071c14d0…

MALICIOUS

PDF

93.7 KB Created: 2021-09-08 23:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe34d5e21ea097729d00996db3f96304 SHA-1: 2875886fe2bab2b7e775f6e7c4233bc84b6f1287 SHA-256: cafe24fc071c14d058aa2a0d42d719ddbfbea8ec38d511c170eb6210f5a1e3e0
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, including those hosted on compromised WordPress sites, indicating a malicious intent to redirect users to potentially harmful content or download further payloads. The presence of a 'download button' lure and QR code redirect further supports a phishing or malware distribution attack pattern. ClamAV detection and ML classification strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+to+use+rooted+apps+without+rooting+phone PDF link annotation
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/66718145574.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213360627d---24320558761.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2415db93---suloturolujunarawiku.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/vopobipenedatikanem.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05b1fd83---13359919485.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/9629551272.pdfIn PDF document text
    • http://inercial.es/uploads/files/vamunofetesonukoxukus.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nabunevur.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/zuvezuxune.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divivanidebip.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2f62ce43f6e098174976581e587b904c/62016521334.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/45329577248.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/vifizaroxuvufuwisidituma.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/28905616644.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/2662572967.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/juginodagugulanojonowira.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lufanetikikimuz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387cea9ad6b---62848842805.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0bb9546b6792e3d79e956b11ccc18ca1/14164254914.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/40757582592.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_B1C8BFE1ADB77ACD.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_054856.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 10800 bytes
SHA-256: 35147aabc874eb9a7f170c608ecc7737f413f0d973c40d67f036d9e1aac4b356
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 17188 bytes
SHA-256: 9d9da5e5010f3167f2e6cb406b81f5a5f2651e06d4f0783f1dbeae9aa47e8fee

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