Malicious PDF — malware analysis report

Static analysis result for SHA-256 848de8b7de802fc1…

MALICIOUS

PDF

93.5 KB Created: 2021-10-11 02:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 510f3c05f6c2a9c7f8f8c35946712af8 SHA-1: f32829a2336ea3073791035756e17c4f78c09175 SHA-256: 848de8b7de802fc170e2bf77c9ca1fd9e6850f3ff733d91253c768a48f2d922e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The 'Browser extension / update installation lure' heuristic strongly suggests the document's purpose is to trick the user into downloading and executing malicious content, likely a second-stage payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=madness+project+nexus+zombie+attack+mod PDF link annotation
    • https://die-elke.de/cms/elke_page_files/file/nuwozusafugekovivimu.pdfIn PDF document text
    • https://sergiomauri.com/images/file/tijoxiratogetomerefoju.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/zegazogovepegivanimabu.pdfIn PDF document text
    • http://inspeq.eu/public/files/24482192247.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/podumaxame.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/sikuropoj.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fce22e9e8e50f1c1f57e5cca47d06d88/62576127716.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/nelofukid.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/nuvezupowe.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/67202929336.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/86256059363.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vivimomawoweludexebu.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/pokijapuzekatexosod.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/sagudisiraz.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tegugurex.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/30272011223.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0f23b7bf---75091373530.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/daxawivogifaxunarubodebus.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/xunemonekugolewit.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/jilujakegibagumosegizoxaw.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/46479176797.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/25088543741.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3734161db7dc8e96021fd355505cfde2/mexowiduvobejewumopej.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/sozutaxudekipabamogipuwuv.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/renepovokelabekasazatax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 11244 bytes
SHA-256: 5a7898d0ecfdd4f5b88d43c9a311e1b4f22ff7c673aeece3a34987c933c0eb35
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 23184 bytes
SHA-256: 4f4976bb36d3449bdce4ec219d2fb4741a443e685327f41957416f78172a765f
font_02_sfnt_off000150af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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