Malicious PDF — malware analysis report

Static analysis result for SHA-256 242935bb13afc62d…

MALICIOUS

PDF

81.1 KB Created: 2021-08-26 04:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 403d6e8f8edca0b0748b4ece3966212a SHA-1: 068906d9603dae46899a476c69ef758068d08ab8 SHA-256: 242935bb13afc62dbb7c8260408430fd9391a3f3ebac8daabfb35f2c8a17a0d2
156 Risk Score

Malware Insights

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

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 numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kawanmto.com/contents//files/45278040976.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ec5db55da21ed3818f361bed98892b77/nafes.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e66e2b9dfef---54300562940.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fubinifa.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/welejatopoxese.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/86584475439.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/gorex.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/68273540174.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/84474503279.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210707_297709ED5FB746D3.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b6487f5de9a1c44be92b4b5b58b9708/vegapakamesu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/65a5d844d9d553b2c0754dd4f4ed4327/fazewulirulofep.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bea55730---gejakewoxipukedu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ace1ce26---rofomagebepajelavomis.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/19980367519.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e04c904e1f9f24527065bfa2e0c74b4/najisoxozinagikadi.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vozivefezuroz.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mrp9d3l2um939mnb0esc5uq4eg/57183538202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=on+chesil+beach+pdf+free+downloadPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10872 bytes
SHA-256: d2cd56c0937f064f2affbdbf8c4db86302a5685b823f49888aa40e412bdb1e22
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 17108 bytes
SHA-256: 1fc007170008dfe44c8d3d5198124e514391ad9f7a8f79547e3580ddb6ac69e9
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1