Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b56bd20ba09c62c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 22:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17ae18ef68909e1e516fad604330528b SHA-1: a14e4f9b07b910cb6bd49d9ca85fe32163ad5d49 SHA-256: 2b56bd20ba09c62c8429e8655010d9c83315cee55e8d062b303b45a910bbae23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites, likely to host phishing content or further malware. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312b371a792---puxeretuguxab.pdf In PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109121828331515.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142f33147a3b---52339185411.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339df07def7---27213629232.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/sawezadipapufelijate.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/24565293738.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/62814175646.pdfIn PDF document text
    • https://tierlistei.ch/downloads/kilipumijepofeguratu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133252e1f326---82578347454.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbd30fa7b---51083156956.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/74365003125.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/29187588582.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/53480715229.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/febofu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8b6812f686a6e0543d7e915c69e92c11/37212455564.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/6436151128.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/22007982635.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614136f3e6fb5---gomagefojasidebuj.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/9002511491.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/29934250985.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/30410910393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dreamworks+dragons+wild+skies+gamePDF 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_off0000b57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57A 16368 bytes
SHA-256: 531a1a2d2847713ce33305376f77891554c168328065d7cdfd3d97ea12ffec8e
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10672 bytes
SHA-256: a40afe2e56af7ba55bb87078388db6775805fa6956d6ed31a26b38a450486aca

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