Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec469ed9c37b1efc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 02:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8353cdcff423c59aad2fa693af5df003 SHA-1: 29326e9c5d88459af94b6afa384c918065076a74 SHA-256: ec469ed9c37b1efc1789e986b3fda40ff17dc5dd6efb217a229005f4ba6e861d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to prompt the user to install a browser extension or update. Several URLs extracted from the document point to potentially compromised or disposable hosting, suggesting a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 https://austdoorcaocap.com/upload/files/gatexododukibetejo.pdf In PDF document text
    • http://iraneto.com/basefile/iranetocom/files/dupukeruwazemugodano.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d46cb0224---98127469419.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/86224797446.pdfIn PDF document text
    • https://partnermind.cz/images/files/danejofuvilojugetiwani.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/fanekuxejoxalus.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jurom.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/58098837878.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc165a307---58221240778.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/69124372595.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109120447029023.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/41904301945.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/xofixifelopuguvaxafiza.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/tidipimosifizogazipuvi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/gosajinanuxag.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/93442652287.pdfIn PDF document text
    • http://nfc.soo.jp/file/majusaxuv.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b293ed995---madubit.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/zosusisopewolila.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/59881827667.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xejoduxurop.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/40087627832.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/lazovakaruxewituxuz.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/95867378857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+chrome+on+firestickPDF 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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 17852 bytes
SHA-256: d927014184e5796321887dd06c5eed8871dff923dffa5610fd1bbc9834532511
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 10772 bytes
SHA-256: ab148a03795244a211188c7767b3fd0641be4612cb31b29cc1f7581d7a3fe3dc

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