Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f8640e8020afe1…

MALICIOUS

PDF

78.7 KB Created: 2021-08-29 00:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52f2f7904f17f2d03b033f684dfca77f SHA-1: c32f26e5bd2b0174f616c98c2d0f5aaf38900ac6 SHA-256: 99f8640e8020afe13c72e78a4e68eddb7949a99620bc0cd2843e54b86148f768
204 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with high-severity heuristics indicating it's a browser installation lure and a link farm. The document body is unreadable, but the heuristics suggest a social engineering attack aiming to trick users into downloading or installing something. No scripts were extracted, but the presence of multiple URLs hosted on potentially compromised or disposable domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://cs-web-design.de/ablage/userfiles/files/93005996825.pdf In PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/rawilaboxefigu.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/6975840866.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/95368782405.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608251fa23be7---48355886065.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/fudegogobix.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/foxapa.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/togoguxetoled.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb93f7ab3b---99434609897.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/74694199068.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gvkn876k9vipgep7hjr3od6auv/27744093992.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/8472511112.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/geginuzikegozelinevodidov.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3njbocil033962ph70grse2ue3/60569108197.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d301a0618---8479339481.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/beklaemamd2o5gme8p45hg216u/75034017693.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/remuworibudibiz.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/49636484665.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/50569523914.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c8e9b815ae150d0fcea75b0675bb342/38129030412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=film+clips+downloadPDF 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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 17228 bytes
SHA-256: 936a1ccdb596a3c400bd3bd74601b3039f2f39398103ff562849c3a11fced531
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 10408 bytes
SHA-256: 2769102c2fbefbc259b7b2e8de34fa5b8b5416b40f413db7cfab3824311a18fa

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