Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87764908e57c205…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 04:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a6bdb82090efb0ad6bb653213534b96 SHA-1: 3ab2c30a2e1ee1f579148e34a9ed66c929b2a8e1 SHA-256: b87764908e57c205c514cec2621aee9e8ea9ec2adee31500c506ac42782d721f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple URLs and the PDF structure point towards a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=schwinn+trailblazer+bike+trailer+manual PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d93090fe---fonulosoje.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210901002317.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d753c594---83668836254.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/9039989893.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161086b831e0df---nejuguzabevijiberidi.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/kiwojudatutisedabaludumer.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/83756791551.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/58032c1d419c7e030ddf27bfb186b08d/xixarewogafawaworuve.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/firujawagixes.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e275d7c7ea69f942559d3c4758109cc2/13322779932.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/50891950453.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/povojotexog.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6f6uk0aphv4n1pstkukqfd3es2/99601608687.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111442742b69---tetoxonetuxeso.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/mamidewumodazemele.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/vesofupavivokuf.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/88692824646.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/lam8iskt8sgnsbj0rse4kj2lgb/90887289853.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zasitijam.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160964219ec616---1838694341.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/86466632609.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/renexakew.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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 18492 bytes
SHA-256: 2e378a208d794f082d88dca7e4bbd8afa24e9167ff5ebe084dc52ec8065b6797
font_01_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 10760 bytes
SHA-256: 5dd33a5a60ccdae6ec0fb5a5866fa95652eea5251d7943245f3d9462b6291163
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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