Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fddacb5e98cfa17…

MALICIOUS

PDF

75.9 KB Created: 2021-08-27 02:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 15b8fd007841c98cf90cc737eed1bea8 SHA-1: db483df848eeaf08c0cb7b58e9dd09e27bc5d7f3 SHA-256: 9fddacb5e98cfa176f9342f2b290c5043df55b1ea14caf932cf3b290874ba2d3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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://a-pointpro.com/cms/ckfinder/userfiles/files/77040753628.pdf In PDF document text
    • http://zuche0551.com/upload/file/72209622586.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/ranazesu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0451b55a1f9e89d6db3930b8c811b9b0/24546061900.pdfIn PDF document text
    • http://nenorm.com/files/files/jokojakadomegarokewaru.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210709222946.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zovuv.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafabowupikuvodifa.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/modetititapaporutudikak.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0c9c6b4a---guzofibipaxunus.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a176b56575---8995268441.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860df251af4---fetim.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bce7d3280---gupagikiruzojufexu.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/42570117120.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/kupibovutepinexo.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160787fb027198---24351155637.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dbcd5b316---17843379707.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/h9shantiijv1e4a0b37an55c34/pabiwun.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b3b910fe---69539993453.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/96121825885.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4pi6c19nch1ra6fhk5fhfqdt7e/negutinigipadukapebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1+2+3+player+gamesPDF 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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 17096 bytes
SHA-256: a0395600fc3495d61ee67efe888b546b91e154afaf03391b8c0983a20223d796
font_02_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 10544 bytes
SHA-256: 7a28e17b7a5c140364c6f4bfbc543e1dec7671f23a9639e448d50678865cb01f

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