Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8429bcc0345020…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 11:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21c6d2668f666c260b44c1b2d7a4c2f1 SHA-1: c4c1516aaca627599dd5dbf71374c824b3d808a5 SHA-256: ab8429bcc0345020983b0bdb055d14609e8403b7a7708a8ecdb92e03e5b1b342
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5947

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 http://mediasingrid.com/js/new/fckeditor/userfiles/file/15911891778.pdf
    • http://bidmitt.com/img/files/file/22351199258.pdf
    • https://baobiachau.com/luutru/files/supijame.pdf
    • https://jungleflightchiangmai.com/Uploads/files/86560810449.pdf
    • http://vina2002.com/uploads/files/67885071328.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/nebubowevesunojonekaf.pdf
    • http://mamitobe.ru/files/file/68626165354.pdf
    • https://ferest.ro/imagini_ws/piridil.pdf
    • http://orem.mn/uploads/files/60025817715.pdf
    • http://brickform.cz/obrazky/files/mepimipixa.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c15e835e2---sasepelogodikamaza.pdf
    • http://www.puhito.hu/uploads/24921279087.pdf
    • https://rjpexport.com/files/tawajixuwadilad.pdf
    • https://kccegis.com/upfiles/content/file/20210906120256.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/91162379592.pdf
    • http://otohondamientay.com/upload/files/16833584938.pdf
    • http://jubileejec.com/userfiles/files/kuvodabevenuzuso.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7ec92d6ade4cbf6790ad788f0a726abe/baluxumuni.pdf
    • http://ruihuitax.com/files/file/lefovipewob.pdf
    • http://shoreluxurylimos.com/userfiles/files/65071123051.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130927cabcf2---wuwejufun.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15f2c523---kakas.pdf
    • http://morard-mcf.fr/data/Files/32772524301.pdf
    • http://highgaincomposites.com/img/file/202198144930.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37066109423.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+android+diagnostic+software+for+pc
    • 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_off0000dcdb.bin
9117e22e9c0e31e76cabaabd2d444bb556e503a60bdd8bea4ae105a707c19614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 18624 bytes
font_01_sfnt_off00010d02.bin
54e3cefbe05be2d9caab7766b240568af852fa25b716681b932678539b4b143d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 10812 bytes
font_02_sfnt_off000125e5.bin
ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 16424 bytes

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