Malicious PDF — malware analysis report

Static analysis result for SHA-256 f631a3fe26bcf355…

MALICIOUS

PDF

75.2 KB Created: 2021-08-22 03:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f93e86ba2e38f0144e4ddc1c45031db4 SHA-1: b28e09a585511dd716173ae331ba4f5e225b42df SHA-256: f631a3fe26bcf3550fac7bfc6f49e964a695a87a771f874aa03da7a9be2f463c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the embedded URLs and link farm structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.jobsincrete.gr/images/_user_na/file/tolewudisupezikoseva.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/gadutogepudesofosukatu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094073d85595---niwewimumuligitorarawo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fb362376a310e65606cf4692f4df5cbc/budanomubila.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f81166af70---bajiredemik.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/jibirivemofulidanasufus.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/46785637261.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/bonuwikifitelabew.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/naxiloxuninosalukix.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/399ec2ef0d3d18c65111adedf0b548da/xopivaxa.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7528378587.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/banotonijagerofisupemoro.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/5913300387.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8ffcb507f8028f4f7c54a07bd86a44b/61742625792.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05098290e---wunonozagefup.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/muwipudifet.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5f46007b8f75d4613bac832b8afaee85/xenatulafa.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/94045891031.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5hvgekrce07i4khu0de41ad7tt/sojopefopiwagewugizet.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/bagomadedulozafadogelawug.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210810232950031290zcu88i0hxon0.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/08764f281e3438cd0acccaff0ed0fd34/30520278828.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/nekawutujifevo.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/mawasosagekabezafopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=supermind+year+2+worksheet+pdfPDF 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_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 11304 bytes
SHA-256: 3a6a64d9d7c85d76aef5bb2b5da89cef2d15e8406519493858f5372402cf1939
font_01_sfnt_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 16476 bytes
SHA-256: 2e57fe379259e299bd51b49af31a9703d7533e588fb82e0f7ad852ff2e610ec8
font_02_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1