Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d363630b0a5ef…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 180ccfa3a89607af40a685a81cbe0255 SHA-1: afe0f27d733f76850ebc1b2a19c440a9387315e9 SHA-256: 2b6d363630b0a5ef65bcdadcbcce2cb439b4461e79c455c51be74f7d78da99a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. Several URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to distribute malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://sccsfz.org/upload/2021-09/26010294278.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/1436403008.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac78e8082---87572444284.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae40483266---25438052989.pdf
    • http://prinsart.ro/uploads/files/24599293031.pdf
    • http://kingbikeonline.com/images/upload/File/35982439914.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/14003242800.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/vuvebitovafebaw.pdf
    • http://alrabbancapital.com/file/files/89169302538.pdf
    • https://razredna-nastava.net/files/19635953233.pdf
    • http://hakanhurdacilik.com/userfiles/file/zobutarim.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/77102740242.pdf
    • https://clearpatth.com/userfiles/file/40084197296.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/21134475145.pdf
    • http://moscreen.in/cmsfiles/file/10389316582.pdf
    • http://ametansk.ru/uploads2/55096456918.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7505194c2---52986095040.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/wakotugujefunesulugu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369357ad64c---50556172226.pdf
    • http://acecaalcoy.com/userfiles/file/94077837027.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/16418963613.pdf
    • http://fanti-fitness.pl/uploads/assets/file/loxademudoni.pdf
    • https://ww150006.linebot.net/upfile/files/20210903193236.pdf
    • http://vom-ragnaroek.de/uploads/file/budewuziwufonawaru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=como+rootear+movil+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 16792 bytes
font_01_sfnt_off0000e9ea.bin
482d147226968c653e60998d33e3ba3ae852d5908db02ac4e186218c6cfa80c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 18976 bytes
font_02_sfnt_off000119b1.bin
ddf4aac9214e3ca022b25594d6e29737f853309d7917f2211a84c178f2d25cf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 10340 bytes