Malicious PDF — malware analysis report

Static analysis result for SHA-256 621001db5b22d2f1…

MALICIOUS

PDF

63.7 KB Created: 2021-05-07 02:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25773fe2286fef06ed7ab49947aad84d SHA-1: f9a7d3a3525396d4446f0d6b31fe19fc871f803c SHA-256: 621001db5b22d2f11250345f162c4e7aa60c35fe4e746fca17ac953baab897e3
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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 https://cructi.ru/uplcv?utm_term=chloroform+extraction+protocol
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c57fd7d91---55134714616.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/147e0a09f9d4a087bc8c6d718c6f4c61/30440407714.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca60a4264b---89272913014.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877afbbf3be---roxegorawuvaz.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u5kh5o6aetccn9df1dj2uedbb0/75900834458.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2jk6p640864ahbkoqt3b7jctn1/winujix.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ef4592c7657bcd2ff3b21c87c013fd74/13442031768.pdf
    • http://atdawnwelift.com/userfiles/file/kapidapeziposilekuwer.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2319f1d---67183465966.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607247270a6b8---wovizabojadusitomadag.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd665cde7---bomenemisumawabag.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906a49a2ff9---65992702144.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dc785c55d78bfad003ded9b0d8929745/larix.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2842159cd86d1b73350852dabf26eaeb/70403466482.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a743d85065---pilavamovanopukujapivipew.pdf
    • http://usaoxin.com/userfiles/2021-5/file/99357980489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04a.bin
5f3586a3fed34104327913db7ecd1b9f7a70e28dd312d97106e2d3f2193721cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5052 bytes

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