Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c00ddb99a6b78b6…

MALICIOUS

PDF

105.8 KB Created: 2021-07-24 09:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c595ac39bbad6b7fbfb19f56d7a02c31 SHA-1: ca1cc18b66cc9638a7c89d6d55ed9abf1dc039bb SHA-256: 3c00ddb99a6b78b6a293ea5db6dbd755de21fc28a20a14933994d2da03d9de7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm directing to numerous URLs, some hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://roweryelectra.eu/app/webroot/uploads/file/16245312999705.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/62641527947.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d92aee6d---rejawiniwometugoge.pdfIn PDF document text
    • http://splogservice.ru/content/file/45042067943.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160920a5174511---63507082443.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c78ab71f3---51566585463.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dde87b73d4841abf84df21fe9e3db950/nupoputexenadowefi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0950c525---xoliwexatuxenadun.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jasaxosatorezufagijan.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xujaxu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/zozixe.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ddc66047896bffb3e94fff75bb2f5b87/vamopisareze.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/rilufuropowegamelew.pdfIn PDF document text
    • https://maturana.cl/upload/file/75545063400.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/92915084092.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210626022934593752rj29e1gwlx3c.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/firilosobakexenupufilez.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/tomajetusojojapovozume.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b63c8086f---62766907880.pdfIn PDF document text
    • http://anupbolivia.com/images/files/93484856679.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/64498650124.pdfIn PDF document text
    • http://dges.in/userfiles/file/nitijavuvodonun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=que+es+jerarquia+en+programacion+orientada+a+objetosPDF 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_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 11388 bytes
SHA-256: 7ff9c12763a10ff2104da969b6e1f7547795a7e0121af3c690938d47cdf5fabc
font_01_sfnt_off00014ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D8 20184 bytes
SHA-256: 58e60ae05a89385c99246674c85d16c89e8fedcf38858ce56e10389ba8d353a3

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