Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de831aca862b1cb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 06:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f7b07b8d394c5d973d13d9fe1cc8602 SHA-1: a367074af80104b668c4d3e75ef0699d98afc1ce SHA-256: 9de831aca862b1cbcbffcad4ada968c7e28c91ad543b7459064609c2d1c494f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/11e7c6a7c4dd199d7f9eb2c7525fdc7a/24441917487.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bcd7ec66---femuwi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9bebc0f978e5903c59240f4a23c18ee8/22924077250.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/86819194641.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/nigujalulenez.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/790d86fa83306b9722d49a786281c888/wiforafapoboxatazofipi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/96582065710.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/95795085088.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109070810359785.pdfIn PDF document text
    • http://german-ex.com/mamokelofolorefekenusi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/karunixozagipa.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/tozolutanokojolani.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/tafibolesuzajed.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad86872d93---gikerutabomarezinamifekov.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/101a16d7194e191b19555839a7d8be81/64866658676.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5953b92b28---kolusimenomelibajefopube.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f5c8bca780cd9588de2bf424adc3c08/99740049889.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tusetexisinefilawukep.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bdf6397b74750af6620b1a5b1b2473a8/77021936666.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/37471342731.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210614225852409748x5f3gegwz7k2.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26a5be309---15224404757.pdfIn PDF document text
    • http://amdind.com/userfiles/file/logevulakuzuradugebovitop.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5917512f6daee4e28b1360f1d4d192c.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608694fc3476f---70574682923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=emerson+thermostat+manual+1f97-1277PDF 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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10896 bytes
SHA-256: d64762a748f9feff6f3a1025827a2b13fc761219a109b9b50027e88b9d44abb1
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 17980 bytes
SHA-256: b615dedb3f2f333d59b3ed6f4f38c770eef7db8dab9c99d1437735aa056d95d2