Malicious PDF — malware analysis report

Static analysis result for SHA-256 657dd6f1c2315aa2…

MALICIOUS

PDF

74.9 KB Created: 2021-08-31 23:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebbd201857d9fd9c7d0f478f8207ca23 SHA-1: 58d6e3d97c15a8d1b31a3abfcdbd65258ef622bb SHA-256: 657dd6f1c2315aa222d31972d9943bcfe0abf21cf684123ec9e61518f17f240f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URL farm and the 'malicious' verdict strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=sql+query+multiple+values+in+one+column PDF link annotation
    • http://csc0898.com/userfiles/file/20210726114642_hdjidz.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/nadifevesala.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/bitax.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/62151994398.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161064411b5eb8---9142646871.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73ee50e3c---68018619617.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/retutotiwefamenidovovana.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd6f7a51a---37724428140.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/32933017417.pdfIn PDF document text
    • http://flomojapan.com/upload/files/59632580029.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/ruminananesivomukawel.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/57635718672.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/150398565.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sopivuzur.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/132214222.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f6063191ac914c1be52da78143eaac0/xapifovotos.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/24347032778.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/24501471552.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/loziwufivageku.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/19639620628.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ab7f2670f349f6962777c8736dafef49/wijofexive.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/zususat.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879e08719---6710004353.pdfIn PDF document text
    • 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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 11036 bytes
SHA-256: e616e42d784cad85a6e73a786d622e6036ff14c895bd1cef08377e3f32a6a9a2
font_01_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 17192 bytes
SHA-256: 31e70ffe57934c41bdbce34b547fc22d9932b9a9e3a913d003b1745a65791a74
font_02_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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