Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f7355e2f5849f6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 22:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd8886b57d5e9cd889a4ca0950a199fc SHA-1: 8cf1bab8a2a99e941f80116bea220ad55ea13ab8 SHA-256: 74f7355e2f5849f6960c220b2e02c21389e2f5042195dcd2aac9ada68179c1db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=chrome+dark+mode+on+android PDF link annotation
    • https://rakowka.pl/userfiles/file/vugefokipitizekikisut.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109052228183088.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/632640806613af6b5c1078.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/6089407705.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53198795412.pdfIn PDF document text
    • https://blokhol.com/upload/files/30010993402.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/21448972775.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jukojibaliluwipovad.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nupodabeve.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07afce266---fojaveba.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/98463696470.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/volig.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74099683480.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gl2p9rnlnga76tln6tids3emv0/liwebuzejop.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/17967245396.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rexizakowixoragadunibolu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f512442700---vetepidaworuviwatakum.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/62289115548.pdfIn PDF document text
    • http://wajl.net/img/file/20219643251.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/46201705355.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/92187508354.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/61832157524.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/98858075069.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b786cf989e32cff7314fef843cabc99/49868043111.pdfIn PDF document text
    • https://hse.tw/upload/file/ditakenape.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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10324 bytes
SHA-256: 88f651e515798d12e46858b3c94342335b823b57f787fa1aaad09c8b6caf1090
font_02_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 17864 bytes
SHA-256: 8d50cf9d5e3aa4431b35ed9216ad4b3d83c54c8d5106f4fa551d607136c6a2e3

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