Malicious PDF — malware analysis report

Static analysis result for SHA-256 164d4431a294e542…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 17:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef48e91db3e23190d727138fff8fefe9 SHA-1: 26f53f86face534e5be28514a2a23ef97dccf714 SHA-256: 164d4431a294e542f927e85831575c687193d9a58b7648ae62b39d66f93d3959
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to trick users into installing unwanted software. Embedded JavaScript streams and numerous external links, some pointing to compromised WordPress sites, further support the malicious nature of the document. The document's primary function appears to be a lure for users to download and install malicious browser extensions or updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://quimicahj.com/admin/userfiles/userfiles/file/wonasirupa.pdf In PDF document text
    • http://zatuchlina.cz/upload/file/60313528382.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161407f18a2561---gumaxilebuti.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/xesopubusiwo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wapuxepututuxusegesop.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/31888406159.pdfIn PDF document text
    • http://ned.ru/uploads/files/62864994623.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/40207463918.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/41131937763.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/98920075908.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nemol.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/gakanadekikejiredo.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xitefarifefoze.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/261233445d26a38d3f6032b4bc480987/87966988639.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/sawigosun.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/14743362934.pdfIn PDF document text
    • https://kildevangen.dk/files/28022097150.pdfIn PDF document text
    • http://portableandcool.com/files/files/95916326004.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/72483262263.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382d8defe15---94300991755.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddadd6e85d---tarofobezezab.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/82256499832.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161363a8940448---lipaxivadikizulor.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/fodudijenaterap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+missed+call+alertPDF 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10512 bytes
SHA-256: 10563708d5084bcf1883b8594cc3501e3f42a8922095885466b29104181c0b74
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 16284 bytes
SHA-256: bd8c46f7a2bda2b313776b7ce4449994717002b874a1ba50450efe763564f044
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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