Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0f971dbac6a55…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 03:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3984cbc89e5f7b3864fe14a3de80cd2b SHA-1: fc956131175598bcdae22e6a53b9ecead7e7edb5 SHA-256: cdf0f971dbac6a559d8fd9c9214964691f08f70f13787858d5f9fbff74bc0410
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links pointing to compromised websites, likely serving as lures or hosting further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ee5acfda---vowiwakevigowosuvux.pdf In PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/91834081213.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/20304999706.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eh2s3sgk0n853n2o6v3qdv7n02/nimisijipilemadejip.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105121300367264.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/25002063354.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/vikodavog.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6639f1ad---62084538487.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/54337058710.pdfIn PDF document text
    • https://topupdana.com/contents//files/giliweril.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608073e302c1e---22530206262.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/89313340216.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/95177089008.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dviagrca6ki3iakli6kopbogi6/kurufifaruxomapagigi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/mumuwarujetesidurefu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b365de8c75---44700144510.pdfIn PDF document text
    • http://airfa.it/userfiles/file/54685675239.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///29962090201.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/12681077565.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/25114016303.pdfIn PDF document text
    • http://hzqzg.com/d/files/81915694833.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843629267ec---gozozesegobejivuluvafufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=s%26p+group+rating+methodology+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 24500 bytes
SHA-256: 25251921f291a4e0ced4beacb0a08b63889f54b313b425e5da9b0f6717d5e96b
font_01_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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