Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a360a8cb0be6f96…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51c7616ad29cd5a25a9337d27ef7426c SHA-1: da0bae57ca6da98e1005f53490af0e5b6b6ba974 SHA-256: 2a360a8cb0be6f96ebdcec5c2291608a243a9f33cdd41ce8f5230337348587d4
164 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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://cructi.ru/uplcv?utm_term=hobart+telephone+directory
    • https://ahl2005.com/ckfinder/userfiles/files/pukujawasuzikasarefujab.pdf
    • https://linhquan-group.com/upload/ck/files/jobinobowifutojumotesipo.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/roxaganexi.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/1734915649.pdf
    • https://jooli.ru/ckfinder/userfiles/files/regivinijigigubasawuxag.pdf
    • http://glassick.com/userfiles/file/vofekogut.pdf
    • http://dongamold.com/fckeditor/upload_files/file/66939283653.pdf
    • http://bociany.sk/media/file/24682566865.pdf
    • http://commune-bourre.com/userfiles/file/bosumukezogubakafaket.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb24d57ad---kabunanoxer.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/jonubevazajibivazelenawak.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/48457375283.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/8313090183.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julubagezezuju.pdf
    • https://argekaucuk.com/nbg/upload/files/7109619036.pdf
    • http://haiannweb.com/uploads/files/xosogikosi.pdf
    • http://siripanyalamphun.com/user_img/files/foniviku.pdf
    • http://www.agot.pl/upload/file/84910035470.pdf
    • https://milorem-service.ru/userfiles/file/gawepipominefefog.pdf
    • http://studiozammuner.eu/userfiles/files/mepogupapaxiwovakapomuso.pdf
    • http://demenagements-remond.fr/userfiles/file/20210904150446.pdf
    • http://hanabi-la.com/uploads/files/ribasafirowevapo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137454130e74---53372251205.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a27c90fd5656724d18f44f13dbd0b092/dafigidofujemak.pdf
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/wuzawunuz.pdf
    • 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_off0000b649.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 16792 bytes
font_01_sfnt_off0000ce5b.bin
46c350d3cbb67a8a1f27130d23e2fb2df0d1aa3b2c7285b7e81eee50e82193c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 15620 bytes
font_02_sfnt_off0000f64b.bin
bbd06499d4c04cf42d10be22e9e973960406c31ba39ac1f4fb2c89b70ce45ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 10688 bytes