Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52abc801e48b60e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 16:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71e4cfed7267dc53d49233c41bbbcfb0 SHA-1: e287fc08733ceecc179f6e61d7d6a3492ea8ef35 SHA-256: b52abc801e48b60e2e176a5dfd298e4be0566ed683ffc9bcc7cc7782b0d67f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicate the presence of numerous external links, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://irlanc.ru/uplcv?utm_term=block+masonry+construction+pdf PDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xexuremok.pdfIn PDF document text
    • http://mldinsaat.com/image/files/19574124819.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608de62bb158c---6147030953.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/81214047226.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/939l6jkrj7so31q1affltjajt6/93690219691.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/duzuxodilarupugowebofabad.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cf0f3bbf5d84e4fc2b5c532cab55cdb4/pagojejowubimudisex.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/77328183848.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kobujedinavodim.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/zigafipigaxikinosovope.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/78283759669.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4874935535b806f9c78f019b2a87198c/guduwedigofilar.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/86246442231.pdfIn PDF document text
    • http://fullx.net/files/lodojaxukivogo.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/sirexet.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/44923649450.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a1ab891a---bovugubekimobulasazu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/16661924321.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/80180318290.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c55d6057---kujisavozowugep.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5fb3d6bda6e85613b8c93845135ccf15/wuripu.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zavetetutij.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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 17204 bytes
SHA-256: 1728c18c363c7bb1738acddf99eeefd06093fb04a93085bfe6dc7466be65184b
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 11008 bytes
SHA-256: 09e371a77e283d6f6d049d56c5f8d89daa043841584f11739acad76a7bbcfe60
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.