Malicious PDF — malware analysis report

Static analysis result for SHA-256 e561166bdcfe13e3…

MALICIOUS

PDF

77.8 KB Created: 2021-08-19 06:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f4f62b6d06b44edec33ec64f3d0f593b SHA-1: 17754eefda0072201110cc07aaac2257a5e7c910 SHA-256: e561166bdcfe13e35ff04b0d9316cff200eb4ae05c696dc94598ef3c0504d970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca70df3df---fulovazerewinagefuf.pdf In PDF document text
    • http://bachova-terapia.sk/images/file/16433078634.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jk3ea0tq98udke9t4mlld9acnh/zesadudideve.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nadakopetufibibuzoloxef.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d089e145399---26051332993.pdfIn PDF document text
    • http://kaies.cn/upfiles/210624023455378021saf7l0.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/bifutogamekozabanafarifem.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e9a1d832---rokaxelotokedenivevurux.pdfIn PDF document text
    • http://blatt-gruen.ch/files/90567581496.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a15aaef102---68916153603.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/merezufedajenuxa.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/gagoxogitagukoxi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/manetonufagigewimokefoj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6416ed8c---79754804457.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/14871638386.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607287d766964---75107899562.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/84629729227.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087432c29109---18052896712.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/rixujifapulavorikumomiv.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g4tpacjj654hvdj022f92c3ac5/93208113899.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec1fbcbed---besapemexegafovute.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/13252058747.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b769504d264a44e496787453f3ce051c/2554749704.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163777ad2f---45617146938.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pivevumoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=energiser+battery+charger+instructions+chp42ukPDF 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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 11232 bytes
SHA-256: e5c3bf7ec90d53983ad46421b5bdc560a314fdb0f4884526cb4593f2617a98f4
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16308 bytes
SHA-256: aa27d9c3574649c495ff1674a3f29f0b9d510cce13a031d370721b264750a948