Malicious PDF — malware analysis report

Static analysis result for SHA-256 76345394561e9d00…

MALICIOUS

PDF

79.8 KB Created: 2021-08-03 07:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93c43bfbc5ac20962c0dddf11862e928 SHA-1: 7a1f2fa47eefb3f3e4d30bc1ae626610e2068348 SHA-256: 76345394561e9d008408bd4d1f0e504da34c15163054f0f9c99f04a1374ba857
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9026

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://noihoithanhtuan.com/media/ftp/file/8378384013.pdf
    • http://altelaw.com/uploads/image/file/riketip.pdf
    • https://apronorte.org.br/ckfinder/userfiles/files/92078247562.pdf
    • https://baoholaodong24.com/userfiles/file/madinuwurim.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b6c317d3b4d2aed34579e64e6c100611/bopobizowoguxiruxibed.pdf
    • http://maility.pl_adresuserfiles/file/vigitunaduworozivatuneti.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/6938962410.pdf
    • http://allmedicus.com/userfiles/file/38777159360.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/liwewewifesuxujive.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160740bfd08739---dutul.pdf
    • http://cl-pub.com/files/files/99344650462.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450511e4---newiferajoxijawa.pdf
    • http://bukharageorgia.com/sites/default/files/file/56139419885.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/596ad6a327a99afa5e6d6364d6df8076/35298833004.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6401005db9---gupiwubapilekazupasipava.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609602604730d---nekanuboze.pdf
    • https://prosperitas.be/data/assets/file/riturededonufowisu.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf437986993---lopujulituvupevavivuratum.pdf
    • http://skincarebylaura.com/clients/862251/File/75193762293.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/gagumunepenavoxokiku.pdf
    • https://aicsmindia.org/ckfinder/userfiles/files/34910547165.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104c802c4324---89175552857.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbed4307bc---fajijipi.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061100501373499.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/lakigimabafevilo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=update+whatsapp+gold+latest+version
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbab.bin
afe100c1b3f21a538d14bde930673af39e2e7249957b0b2aa0a1e5db29fc5dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 10832 bytes
font_01_sfnt_off00011479.bin
0d51bc3b9582079357395f7787188083b36286966ab9fce231728a5657dabdb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 16764 bytes

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