Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bc81e493c4223d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 21:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 515fc4273b5110ab9df7a352e9057dd0 SHA-1: 7b2e9631f8a4c23b9f6d015e5e0123a28b8d14ed SHA-256: 82bc81e493c4223d569b4bfd064d25203d6bd2e0c14afda9a3d4bc9aae162f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://drafthe.ru/uplcv?utm_term=oral+and+maxillofacial+surgery+mcq+pdf PDF link annotation
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/49326086962.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8662847b2---xoxevejewil.pdfIn PDF document text
    • https://atl-50.com/files/file/dizikonuxegivatabafoxusa.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/85525543770.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8793d6a43---46361620038.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608944e3568c4---75946782866.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7863aaabee9dfaaf5369af3bdc967d8a/xobenevix.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/senidedofo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nogubutagiwutumudiluripot.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95967560575.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/58217383197.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45ce0fdd8ac8d0b140e49ae0c6cc1166/gubaguzisevetamejinamagu.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/82159923637.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69294e86b---57788973386.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/40978030482.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tineladojogufewaxafo.pdfIn PDF document text
    • http://primaneighbors.com/userimages/92640607486.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fojufirojifovitobabeb.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090033ea1ab4---67189300088.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/58009362621.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a59bf2cb89fe597075742dc281486250/83578394361.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094caa463c3c---zojifamulatujuw.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/76e76de41553b78ab5998005994c3910/robat.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/8275409569.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/mogajama.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 18532 bytes
SHA-256: 5776bc0e1ed90cb7c84d8e7760db82cd38971d3b4a8f387eb598b829728edd7e
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 11352 bytes
SHA-256: fb2af6c8a15cf591a57058519f21b26678994b4e54c3003d81415b97af242d03
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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