Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a480ed553d73119…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 779f8180e97d063b660d2a86a4c34643 SHA-1: 41dad905d25c6dd9ca36c223794c455be2760402 SHA-256: 3a480ed553d73119d1da2901fab9f97e4e441ee626af2303579eaa03f7237693
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://telangana99.com/userfiles/file/84515782651.pdf
    • http://mixmarketing.vn/upload/fck/file/1140462659.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/92414033731.pdf
    • https://calson.garment-pro.com/ckfinder/userfiles/files/janewugebofu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613229dc3ecdb---67231902412.pdf
    • http://le383.com/uploads/files/10795444894.pdf
    • http://digivideos.net/ckfinder/userfiles/files/taxere.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b14a0de540---21921459439.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0e0981785---zewexexusoxupofolosedagef.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bb4e44d68029f5bb2b688eda8be67630/33577917773.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/87674366571.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/19d23db2db4d6c86ec7b2af6d69485b9/65191469331.pdf
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nijazatuziwugunivinagujo.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210918_84834D22C3FD54DE.pdf
    • http://adria-ex.com/images/blog/file/7458922463.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/tejituwesek.pdf
    • https://1877painters.com/FCKeditor/file/5802268779.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161352d56175c0---simobezosixegoki.pdf
    • http://viettelhaiphong.me/data/dulieu/files/27915292112.pdf
    • https://soechi.net/userfiles/file/54322409997.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe77a2d7---wikidu.pdf
    • http://fishtech.org/uploads/userfiles/file/file/86098352463.pdf
    • http://thunderstar.cn/userfiles/file/20210910135936858053881.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+apks+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fd.bin
9627d3362f26e50e12eb990989845061903849f655d4a3ba58c6dee2de1c7736
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FD 10420 bytes
font_01_sfnt_off0000d0b0.bin
a17104cae823ebc45a36a79cd461efa0a9098d847ae9a3098e8419132ea42d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 18272 bytes
font_02_sfnt_off00010019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes