Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b9055dc6940422…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 00:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed505379d822283aaa118eefd41bc219 SHA-1: 088a2a3f40c4eb71e2ccc0e8139fa5ba7822eab5 SHA-256: 37b9055dc69404224ad02750e862f0090a9d1f94dea104ea7148766c5b27763c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://www.udelimpa.es/ckfinder/userfiles/files/bimedivut.pdf In PDF document text
    • https://artgalery.ro/files/file/90352082845.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996735ddf3---wuvavo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac84b3a88---kejafoxajimoso.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wunodubusenifegi.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/8e3b0a4456e3b3e7ad271092d0bfaff9.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/54745220664.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zexugogiwulelamowinawaw.pdfIn PDF document text
    • http://tyextractor.com/d/files/28966159331.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/4567254305.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/lagupamewogaserububepivuw.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/roxesix.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/95025438851.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152360cc7c6e---jiwiposunarupifov.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/64365671312.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613983d1258e5---namepodifugexajat.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/70083692498.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/43366372655.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/pujikojakevubef.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/15623007128.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/warogagosaro.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/radubafebakije.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109101253397900.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/49973801517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+the+akimbo+pistols+in+warzonePDF 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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 11068 bytes
SHA-256: 9ac839ac2536225f5aa2e5664f9697b59a87d8a65d6b2344c4c90f0e81f76a0f
font_01_sfnt_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 14444 bytes
SHA-256: af6e1f419c372567239c422dcfa5e53721e0a92e3dda5c150de0ec1e1e6453f4
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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