Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d9df532408b887…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 04:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25025468f9e82e337f6a26f32841f5ec SHA-1: 99e51ef543c3f097ea3b903a7ec3c720a2e34324 SHA-256: e9d9df532408b887954dd05a5ff8b000a69a5cdf682abb3740dcad4a772a6839
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kobevurozigimaxu.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/jitolidanedabelipis.pdfIn PDF document text
    • http://acelybio.com/upload/files/falewip.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/19866983907.pdfIn PDF document text
    • http://ministerium.pt/files/munitibugogeg.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dekunukanaretafevefi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356f6b3c5ff---guluxajo.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/lanidegunulepoburaruviwis.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/46583131237.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/senovuw.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xetilifefejuponebu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cab06a83---39567646880.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ff9c465---37412875312.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/93702825593.pdfIn PDF document text
    • http://dgjst.com/upfile/file/52189856497.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631567405zuzepamapuliz.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/46594163102.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/38408978307.pdfIn PDF document text
    • https://jensbrode.de/files/file/kepuvodusavatufitikin.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/78221877593.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/20155687998.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/birefara.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3d736838---41161743120.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xerosimazikarekikigiwoso.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/vokusatofotefokirubani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+photos+from+android+to+pcPDF 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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 11096 bytes
SHA-256: 1bea24c81c2dbd762c4e4148516119ddbaf3028dd7ba1587f4af05e67c7f8c5e
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 17380 bytes
SHA-256: 26660ad05b37de2072b87a7a6b4ce6bbe912545021805784baa5c0cb97d9ae98

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