Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9a6052ea58506e…

MALICIOUS

PDF

91.8 KB Created: 2021-10-11 02:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1a097d8859e03035d427d622134b4aa1 SHA-1: 5e84ee361c7c7d1006521d6f7b08c3b3f33a7cef SHA-256: 9a9a6052ea58506e2616343384977486cbacfb9ec970d5364675f67b91e46ea0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents, many hosted on potentially compromised websites. The presence of a 'download' button lure further suggests an intent to trick the user into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/3902151147.pdf In PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/batovenusijil.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zuneremetenubesosi.pdfIn PDF document text
    • https://alohasafaris.com/files/wunotoxakaxekuse.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615dde7946d31---42393190930.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kewovurukodogoxapupedudo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615580387f0af---sarisuj.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bojodanavaxexoladivule.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rogejitilumidegokagumum.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0c88f3a9cdbe35ccb5c01cd77ea87fb3/getifo.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wezak.pdfIn PDF document text
    • https://expomediainc.com/upload/file/xopadototamawujofegum.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/39098777521.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/82470114767.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/sopilowumedozujawelanim.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/pubokuzisozipeseg.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/8912132518.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///13032600270.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/dutizoweworenebabesosiso.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sinavobawolomebe.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/49646778910.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e8321f7b277867d39a5269d2ad72bdeb/84527904269.pdfIn PDF document text
    • http://chamdure.com/DATA/files/37830310190.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/77731913149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=concept+of+modern+physics+by+arthur+beiser+pdf+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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 23020 bytes
SHA-256: 86ff5c3f30fd644d1a4637bd4a57abad009400a98334cdde761d92814e12a39a
font_01_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A1 11356 bytes
SHA-256: 7cd28dafb52809bc6d90ee746c25a1eb9f061ad7937292ce31e651dd52fa0f12