Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a04d72d20a6b0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 04:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 363041fdc7342169c8f292d742570c7e SHA-1: ae55b22e20451f9321d45f5d305d41887ad33636 SHA-256: d66a04d72d20a6b083cdcf5c232fb4f6b31cd1a9c2ca1ff1f30d3a46825ece6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. Multiple heuristics indicate the PDF is part of a link farm, with URLs pointing to compromised websites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=numerical+linear+algebra+lloyd+n.+trefethen+david+bau+iii+pdf PDF link annotation
    • http://dawahcity.com/userfiles/file/sukozesesozuxobatoxa.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jebibimuvigowis.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6412a1cf3bf3119de06fbf06e54a3e9e/roxosojula.pdfIn PDF document text
    • http://iccarrentals.com/files/file/71121538773.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612387f63cbda---detodufogopejut.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67174382005.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7c08a121c628b2b622b56dc511f8a71c/98794162491.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e0d98a5f---zunosorijoxebur.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608519391adb9---xupesadogiwekilonumumo.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/96820008748.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fujexutobanotuxujavowuj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/11t9tssjtsk7f4jr9qpps5ukl7/vuvilajuwafejes.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/lujixobojufuzeduzeke.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f793354889c---bovor.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/xepevot.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/7226176643.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/48032908735.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/nojulezexedorumufusiji.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ie02sjhtrc4oolcvavso8eoqe7/lubojaxizovipumafelas.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/goselisul.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160def98547e8c---zuwuvetade.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ci1pp6feolm71m3l56s6q1ugr4/totidipigubijogilusixosa.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17020 bytes
SHA-256: 4ab9b486c01dc2908677c12075034ff624e9e10f2a568f11c0bd0a4404443c05
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 11360 bytes
SHA-256: e14a32e5eb60c67dcf3d42f558e32aeb919655846e749734196f50f703ecf829

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