Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b7354999258edc…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 06:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06133af7b096dd01fcc3355c4245bed2 SHA-1: c4f478f54ee7d05b648aa37f3fce2517a42e139e SHA-256: 75b7354999258edc450275f515450ec0a5f8ccc58b0e91d2b0d29a3b6caaf441
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=car+eats+car+6+unblocked PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614067de6b194---sawaremigalifinosuj.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/devuwubajekamifukidef.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/rinivemexi.pdfIn PDF document text
    • https://tigaintan.com/contents/files/dusepafisutaxuxoneje.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/ridebolejefa.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/7151046371.pdfIn PDF document text
    • http://envigest.cz/upload/file/95563457048.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099b2858cb---jirus.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/fezujawe.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/89712884347.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631507620.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/daveki.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/rimerunegadirefisirixeb.pdfIn PDF document text
    • http://air-ned.com/uploads/files/15493833955.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/40282856797.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/pufabewefusuvil.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/nafiwusodawoxofezixiriko.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139be4a578ac---54005520603.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16315998745758.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/50631625913.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/7204236797.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318688c4b49---piwobevamewovikexe.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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 15860 bytes
SHA-256: 993eb5da5220618f6c212a11e0d6b6226c872cb0fd4ff377c346fb791c10aeea
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10800 bytes
SHA-256: 634f9ab450d5c547c41c944137f1d8de9012967f75701ce8f6fe1e781604d6a4