Malicious PDF — malware analysis report

Static analysis result for SHA-256 8617a9743094b281…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 10:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6b88ff9b998bf9740709194b3db36a60 SHA-1: aa431326a7c9a24b7fff7c857083da4559745735 SHA-256: 8617a9743094b281a9b7664563dc7b7fead11713137db9db6174d0e4ac8cc24e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. 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 0.9975

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 http://clear-es.net/yamituki-n/uploads/files/81554664103.pdf In PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/20287980904.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dijivulajames.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/teropofilubirerukapizin.pdfIn PDF document text
    • http://caratow.be/userfiles/file/batinelu.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/90266090319.pdfIn PDF document text
    • https://dalba.net/other_files/File/dudapowutuvutivig.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedokiligirafaledojiged.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/45508234605.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/livokewisafiv.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/48297792701.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/nozuwew.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51760627---febakukipubewisej.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210901085445.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/damaxaduvujikoximit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131310dc8c1d---ripufuno.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce5305a9---65289005547.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/88577302634.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/84277020034.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/55607528874.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b0e19abb---10904373692.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/murota.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zijozemodekilurujedanagu.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/20607537949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=special+purpose+software+examplesPDF 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_off0000b3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F6 14784 bytes
SHA-256: 4241f320312a624d35fcd1c0474d294d0ae708db7c713f30377589d10ff9e4ec
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 10900 bytes
SHA-256: a0cb714f6ea2bb7344f74e4d2767b6b3f693f90b55e9fa665fb7e8f80f007a6b

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