Malicious PDF — malware analysis report

Static analysis result for SHA-256 acefb54edfefe3dc…

MALICIOUS

PDF

131.5 KB Created: 2021-07-18 17:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47167ae1d84900d99639e5ae7d28a54f SHA-1: 87c8f6abcb579d0c573c7a99dc1fd0db08ccb97d SHA-256: acefb54edfefe3dc4e554b10ddb3d398a7090a5dd07ee85ca6515e509b8c3125
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/741c42b345d3124004857566f5d83413/rifove.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096354f412e4---tuxifufovelefozalufiwilu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/18431843823.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608349be2f2b9---pibijixanu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2ad962d1---93611219892.pdfIn PDF document text
    • http://samtekelektrik.com/files/26888069529.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/61078333728.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c8e7bf066392f9013571c8b3aadc7fa1/53213236580.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/68330184443.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b096cdc6a84---jijipewujadiwosarif.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/23508657459.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8758e04bf---zadisuwipogulukegesusexud.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/fuwadojepexuxapufe.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/pewogiwidamilavumu.pdfIn PDF document text
    • https://businesslife.com/content/file/11823616067.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/abb5b35b5132dff21a046a1ef2685322/motirofozowesikupek.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/740dc0db67820ac402579b629823ede8/24917029791.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3742b67e3b---vivokelixogulepagawak.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e409b0b8a960da76873092eca8109c88/sesubu.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/jebarelisiwe.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/30422d8200c334479c96e978a1c9ec8d/bamatofazapifezuvetomezo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b21095d09cd---pexofa.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/39261803724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=born+with+cleft+palatePDF 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_off00019e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E5F 19496 bytes
SHA-256: 9cbcbdca8e1559b3a23a9e82fbcb558c60c1475e9380bf310065e9b7249c305e
font_01_sfnt_off0001cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFF0 10548 bytes
SHA-256: ce9972e999f071fa4c219e31da2f34d13519bf4b8059c3e7c022d70a2bc45e88
font_02_sfnt_off0001e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1