Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7d9ee2db783ab…

MALICIOUS

PDF

97.0 KB Created: 2021-09-01 04:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfccc985d21e2959e566edfb96e9afc9 SHA-1: f96c168222094d0f3301038f0a5168bc11325d5c SHA-256: bff7d9ee2db783abd7c8cc5e24bc2c7cc71f8547bd660ad97b76e368d371971c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure and URL patterns suggest it's part of a phishing campaign, potentially delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a464ba87468---85429913656.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36baf27956---dibesotoruk.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/gusosuvivu.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/25164445927.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/nupafeposugijatib.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/18693270380.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3a05f79f---muveripipuweziriton.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/xovip.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/rufeze.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbef8ae0b0---88460226030.pdfIn PDF document text
    • https://people11people.gr/uploads/File/jamobivujamede.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/50294022071.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/51845292237.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb674d70c3---likajegefusovosabejubote.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d3026e446955d0bf28f69ad0bc3b1911/saderigekovore.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a39e867c9---23690261286.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624181136.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/59621080021.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/74061495556.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/16661648724.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/17994012039.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501202159842226822.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pemidalabetimije.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68d1d2ce9---revovigofifomuvenoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=borat+subsequent+moviefilm+watch+freePDF 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_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 19228 bytes
SHA-256: db829a858406d7f2968f41a88691b24c513ff596c741aaa9810d49eb72878d87
font_01_sfnt_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B73 11192 bytes
SHA-256: 898d9ec6bfd2c494b4ed5ec4fa6ee427026702830214c3d4ca979f4695204e7e

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