Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52a42c7ae8eb2d8…

MALICIOUS

PDF

83.4 KB Created: 2021-08-11 09:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8e9cc70a0c9808b6c75aacb3ab9c14b SHA-1: a84706f83dd61e5f8fad7ae65d527a86967c45e2 SHA-256: e52a42c7ae8eb2d8fc2ff2524592d44b32045727b1a2a5f8ce5ac5fe1871f300
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs hosted on compromised websites, likely to trick users into downloading further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

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://siciny.pl/userfiles/file/jegefunijifon.pdf
    • http://sungsam.net/userData/board/file/likesegurafenipaki.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a1b960a8---bavinizob.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/10f28c33a170d04dae6e99800c98dac2/52341612080.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/74f12edb308ec37e557240ea684165cc/63168403004.pdf
    • http://royalgoodviewresort.com/Uploads/file/81369576676.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tvsep7j5l1kqdlrlrhebv3su69/43403826840.pdf
    • https://indolabtek.com/Uploads/userfiles/files/89777171814.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d7d12b965b5e3c045f137cc079f3387b/kobijiteradididi.pdf
    • https://sportsht.com/userfiles/file/perosorisozi.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba01ac3e1---840149973.pdf
    • https://syteq-pro.com/userfiles/file/luwezoxokuj.pdf
    • http://vanharteyoga.nl/uploads/files/86142777887.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed84b5c---jufesunulasupoxebaxelan.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a038ca25e5e---fepedekufimofivarefev.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dfu2f9cjl7pbga9ud7ilakbjdp/87596897312.pdf
    • http://stellamaris.cz/userfiles/15372385593.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0d9643d3---nejetefubenixit.pdf
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1626247453.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3d4f3f53---92923810547.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=doulci+activator+username+and+password+v10
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e33e851ea26ccb81373239dafc2d6dca/255232472.pdf
    • 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_off0000fbd0.bin
9d6cb7e4532b8c6bca79876b2948397ead1c983da6998b0e27fb2e4af6579bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 17828 bytes
font_01_sfnt_off00012a07.bin
5977d3867968e9f5e71005b28452b7211fb1a61757fbef9c2e700b1c6256e58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 11100 bytes

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