Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78804a65a6c9fde…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68b998be110ceae39a0f5a24ff1df519 SHA-1: c0f70c34852a8dd9363230f2e2c1f84b71497411 SHA-256: f78804a65a6c9fde62c0b85eeab6ac1cedc87974a68f2d03515c6d45f44b501d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://spacio.hk/attachment/file/wurarewoguwox.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd54f73adb---vovozezoduseboka.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/8400015043.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/julometuperazidepot.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/zemeta.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/71980272212.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e536d0de3c044aa5bc5bde7332b0f3d8/22457074130.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/58999097136.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/leguluwevuwujatamod.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610f92ad65d32---95627350648.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/tikebigadi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/wukutosepatuzupunagevopo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc206677c1---segowoxiridopojas.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/21888883054.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/lulujarivibaxija.pdfIn PDF document text
    • https://ms02bet.net/contents//files/96797632430.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202181018424858.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/40975494527.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fotesevalijiv.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/35830806546.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/26474018022.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/malobevesofepivix.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nafabufamoxelusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+duplicate+in+terraria+xboxPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16816 bytes
SHA-256: 27926bff69fa841101dc7fc58971787176cc4a650ee5016d76ef78425fe92f8d
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10760 bytes
SHA-256: dc78f543b7746bb7ff945a2b15c6949b05feacc6671b09d9d0552ce6feb51599
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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