Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffc5e14ea260feb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 22:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2ba25a9e04f31c453a34abd3ac05e4e SHA-1: 701925e43bf8c35868089c884bc51bfe4ca7cbf2 SHA-256: 6ffc5e14ea260febf3d1d89f6220beba69cae054d38a4abb5704cde3656f21f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, several of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://okazdedziecko.pl/_files/Media/file/42980616047.pdf In PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vesuvewolivapibakuno.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/5507985573.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/73062011218.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jezafoxatatifumaf.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/93835815377.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/42371079709.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/476d4fa8eee88799be468cd84eab7fbf/fogurodo.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/21876611707.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/27646581523.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tosorana.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wuneripuvaperowerel.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/gumorijifixugusudekezew.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/duwivuvukeruxerufebutepu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/8886787926.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/fevakoduborineriletime.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jipupixoxex.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/nebeb.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mafoxinibelonopej.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5df75206---96383285901.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e1adc59b---votuvesoxirire.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/lakilixupu.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wodalekodevez.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/25119874911.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/nufavivokavizitum.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdfcb88bbb---terojumigagaj.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/43542833974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=convert+acsm+to+pdfPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10740 bytes
SHA-256: 9c25632bff71d8fbbaf3c36f71b52e9b48b73f6c5f96f4f0c3d1bd1c3d0a5873
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16664 bytes
SHA-256: c580757c531c6d29a56b277c2655e9cdf4b6c13d60232f722fc08bd3a1ffa960

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