Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9b02d6bcb9fd81…

MALICIOUS

PDF

102.8 KB Created: 2021-08-02 14:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7e9e97e75c398a65c268da1e3098542c SHA-1: bf73cc868c940d03fae73fa0a7c0f00ebe1444b9 SHA-256: 3a9b02d6bcb9fd811f5b84ee2d01ae0a881c1687dd9a95145329d624fa0cb40d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and potentially disposable hosting, indicating a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely as part of a phishing campaign or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9c35aa50b95db3e4f7142fb750b1e5cf/49219828490.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/benirige.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xoruvowiwuvutabila.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/gakaxarubujiru.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087182ccfff4---zisepekojuzitodezomezar.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/jozaremusedaxumu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d804082c---48519305320.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/53837824372.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607710e195d4d---xorenenodutonomilapibo.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/44981134695.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ea0e304d4b041e34a8c48693df4684f4/kamiwadusadabik.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/74597725398.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef57c24b63---gametadilirexofe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff24b25c436---33074076911.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/magagelunop.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0420fc11---64220701202.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6db82147d2---3600854744.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/31863734113.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95266264346.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vebijewir.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9a36b51d9a7913dd5fd996c31db1fca6/wunuzigezulefujediriku.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kabole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=estructura+de+lewis+de+fluoruro+de+aluminioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17924 bytes
SHA-256: ed3ece64d2c466f2224fa5797d4a5c95150d1823bd5e02022b3eadfa0bb5edb9
font_01_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 10808 bytes
SHA-256: 5ddabbcbe7ec254ab337a6db620c0361015258a005d5486e3d5d271da290934e
font_02_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D5 20520 bytes
SHA-256: ea4ebbbe485b40278a42fc263cf8396b244ecd8b6764759bccb7933ca489509d

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