Malicious PDF — malware analysis report

Static analysis result for SHA-256 396576dd0ee41dbb…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 17:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bc145c5fa696c39b872eb7f776c264b SHA-1: 59db44fc2790b9ce3bed9410e37e03def309c3b6 SHA-256: 396576dd0ee41dbb7a8fbf73af60e187bd9658a8b93b52fac931bca9c1af4bb9
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristics indicate a link farm designed to lure users with a 'free PDF editor' pretext, likely leading to the download of a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=very+pdf+editor+free+download PDF link annotation
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/36280018612.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720e83edc5---jusem.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69230ee66---43932508456.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/susowukaretefa.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xevipuzulonunivajatiro.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59335507168.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5k4o4f67g7ejs7peuq76kjr9mp/fopag.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/rumolaretibusexepunut.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e29f5a122---sosujufu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f1b9be08ad09ba7667e193dd511589e2/xunifudaxiwekez.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/15742531842.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc5290d60---25670139659.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/49627738008.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/moxesalanavudixu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7fa3fjbed1pts71c8v577jlcrr/xamupofobonaw.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecf51a594---jomonafo.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/79211614871.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/rarubunuxukojapadebelegi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2q0l4io7achbfmnmhrvcisici2/kigokapefogejadulopewuku.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bd4e0a9b---fawelivap.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0bb0819cfa1e1321a7ee1ed41e46478/vokepikiroredaxitaxe.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/22513443064.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/jiliwobefijikusefeguper.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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 10492 bytes
SHA-256: 15316b8f820d93d853dc857dec4d5a064a032e6fb4ac768c138be14b54f06ce6
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16540 bytes
SHA-256: f10b86fded651c82138e2f5db5337cc688245fd20321b259a27d995187be711e
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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