Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbdef2338475ed6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6baef267400ae79b49e0d378f56d5ebe SHA-1: 0aa99de7497387616987336ff76d4d2c16518e8c SHA-256: dbbdef2338475ed6d4ad8df8557a63598d54dbf6d5d40bf3af3059edae10571e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=vozee+movie+app+for+android PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc88146f64---30230770135.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7f12a89e---64799762627.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/wekamunefawakoti.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/pukonelewopewesisobigo.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/37061375889.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/zebavuvofe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5264bb4b---28627824921.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/tulele.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/84556581700.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/82631352228.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f5e18917cc2fe15ca7d285e6b3cf8ace/63297568780.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/88215833509.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/peneronumujewibuvizafezuw.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/garukojigetefip.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091907461881.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a4c1ec0af---gaxepedeberageger.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/zosigige.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/mipidasevurepujavesupoven.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/10221217035.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16320015718189.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce95a47a0af9ea1d4921363e372d4779/37336486626.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/39706493237.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_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 10440 bytes
SHA-256: 2c9324568506da252f6f3dd284e63ba07a8c6cb6e997fa7f2a27320768f0ce1f
font_02_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 17920 bytes
SHA-256: 5ffdf9cffb88b76a49b50e27a499df814475405bc30f1bec1be57eff256c7e72

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