Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e1dad2da4fa1c…

MALICIOUS

PDF

73.7 KB Created: 2021-05-25 04:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80d0336088a3179ed6e7e83da0375616 SHA-1: de9a01b9230f90eeb348e0018ad1f7ec2d683ed5 SHA-256: 9b1e1dad2da4fa1ce08cd0668f312ff9a669c77bdb794b416b46c1199b224654
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9297

Heuristics 5

  • 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
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6d31ebf2---33531753814.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cef614cd8---rexobojuzejukubufesedax.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6fb4d6be---71240210609.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4194c1eeffeb3006520d6e00fc0d6ff3/32769231747.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a630947c5abf65acb5c9517d9290dfe9/52705716391.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/679e010d502204800c63ec2f94b22c82/76807172481.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cf6b63b9d9---70048556516.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/6556026291.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ruv6dgegcajap1do3rp3jm239p/xigakaporobataj.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d9cc2d88---23324033397.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323d0d8ec7---18119037325.pdf
    • https://alexandrapanayotou.com/web/images/static/file/pabulezuba.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6a5edf85c1303be7f6b591f9ee835dfc/41946077551.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/53157f73d51db8b939c378709cca970e/wujuxifeluruguwum.pdf
    • http://sungsam.net/userData/board/file/wadit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=physiologie+v%25C3%25A9g%25C3%25A9tale+cours+l2+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbc.bin
87f9a602e167a601e95381df1f5639d3476ab75df6281998d4aaa9e5611abc92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5856 bytes
font_01_sfnt_off00010078.bin
bf314d1683f199a44ce5099d9be3934826f8f4a34176ed8a638046d5fdf921c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 12700 bytes

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