Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eea720e03d602e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 13:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e0eec20905444ea91c9dfa6adf6deb7 SHA-1: f2fb85cb4d8111f66e6e42d7d39d4f9875d4ee0f SHA-256: 37eea720e03d602e7c7fccd97915048146e95321931234e1bd6837840b209c15
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised CMS upload directory. The PDF's structure and embedded URLs suggest it is used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lienlacanien.com/img_pages/file/29588009943.pdf In PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/58645474095.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/97ec11ccbf63c6beb5a9a42d8493404f/zubenalika.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801edb4c1b6---xegejuwupamez.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8gc0abt786b6g2ce6ps91203n0/37914175198.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jobemili.pdfIn PDF document text
    • https://suksesunited.com/contents//files/35125961962.pdfIn PDF document text
    • https://kimcert.org/E/file/zesepor.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a6907860---46354301626.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xexenafamoxexeli.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nbplr8mritdbakq35idjgj6319/nopelow.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/6318356017.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ed576547---roximowa.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/7891834329.pdfIn PDF document text
    • http://robedecreateur.com/img/files/fibupixomujuporiw.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/22cfcdfebe5651e2bf114cee4852218a/72276689770.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/33884730753.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zisixetilimo.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/45883129404.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/jomima.pdfIn PDF document text
    • https://seger.cz/userfiles/file/kizefo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094487c3a7f9---negofotevetegowuxofeji.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/45721003475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cbse+class+11+business+studies+syllabus+2018-19+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/346afb959d91f7a722919dc699339777/90444198067.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 11480 bytes
SHA-256: b9a99528cf7f933ed203857cad81c85204433f477fffd245dece89ad7915a957
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 18276 bytes
SHA-256: 2bc7d8279ff6524018fa2bbbe12f87eabf795acc543a6d259508e98d6f255fdf

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