Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bf4acac0e6b83f…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 09:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2709eae584d72fedac580f0f5e207e SHA-1: 1972f4b994c0cceace758d9b6990e665944fe963 SHA-256: 32bf4acac0e6b83fcbb49400bcd403c19016c906eda4f986378a6d90bcd35f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=an+instrument+to+visually+examine+the+eye
    • http://sethhukumchandschool.com/userfiles/file/larujofebejom.pdf
    • http://caopump.com/admin/userfiles/file/34162206583.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c114fbc363d---10888734139.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/403026335938eb94cf9b6134cd2d30c8/pivatelifixofikedaxe.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7a8250f92b1bec2f226994384615a2ae/64510167248.pdf
    • http://ceresasrl.it/userfiles/files/sipetepekumudizoweko.pdf
    • http://unseenadventure.com/userfiles/file/jaburirubupinumipef.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/95huukvsl6vjh8ps8ne091eed6/ropezo.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/fd36f40lou4oj5qg4evva3dj2k/74220623911.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e6420761---27182121086.pdf
    • http://studiozammuner.eu/userfiles/files/xozirelukakafesilutukuk.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5d3b904865c55de909867c031cc0217a/giderelu.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e9f725a5---24134830723.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q73815tp947g0jsi0dd8f41ju3/tasibim.pdf
    • http://www.kymkarajok.net/tiedostot/files/gonig.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d963ea69---mowetinaf.pdf
    • http://ajisushionline.com/uploads/files/97011936393.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9cbf7935acb1b88b3a8f19fa5337dbf/toduwumanozi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d5304a7b9521fce4203c28ea8bacccb3/26493175664.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1be4452cb74d0fed748d9206fb881493/90934692873.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/888b8792a90d33cafadd2593c40e4dad/46592974425.pdf
    • http://originalcheck.it/public/img_admin/file///sisuder.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/j52g7c976c2a61j9nfbmhhtpu7/megozo.pdf
    • http://angelcabrera.com/FCKfiles/file/31215431453.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd43.bin
0f15f78e7b0df0d41d8cef8b016588c8c2932b7fbb5e33dcd1f53d4fee9deec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10736 bytes
font_01_sfnt_off000115de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
font_02_sfnt_off00012df0.bin
9780ccd33b5d54035b234eadda6c56c1bffb7043ad4b52fd79378b051c996c22
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 16408 bytes