Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b91c8ea4aadbb31…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 18:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f93d472c700ac607b11793e249ebd148 SHA-1: 9aeae1efc3b21e613157a9a357f58b0c7565ae70 SHA-256: 5b91c8ea4aadbb31ee542110e82a7fdf92dd77688f96c1ea01daaaea966b8d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://prakseologia.eu/userfiles/file/68301694083.pdf In PDF document text
    • https://suadienlanhhanoi.net/upload/files/18295386232.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/redotigosapija.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/modemimidika.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe233fa1e---28310957732.pdfIn PDF document text
    • http://artospace.com/pics/file/79025081313.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/75737039786.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/32484744633.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/zuxuzu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021914555205512.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/49373106512.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/25031675237.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lapug.pdfIn PDF document text
    • https://webrobogo.hu/kepek/80554663175.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/39329074076.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/63272196925.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/bunabusaratedatax.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312e77c8472---sumupefewu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/caf6d563f205163715b107917d1b31cf/72120214495.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b0fbbd187ec011c7fdfe0628791f49f0/15583007096.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/peviwoj.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020848165666.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/31709148660.pdfIn PDF document text
    • https://kueapem.com/contents/files/55761809303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=need+for+speed+underground+2+download+for+androidPDF 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_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 10860 bytes
SHA-256: edba13e063ab11d63fa00096cb8444775c087216501b330be2eeb198c4848b9d
font_01_sfnt_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 17788 bytes
SHA-256: fc6aff960d6ee66e6607571e26877d759421b114d173de8fa54e32089661012e

Open this report in the interactive analyzer, or submit your own file for analysis.