Malicious PDF — malware analysis report

Static analysis result for SHA-256 54549c2097351dd4…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5888bc6a5bff225eead49846e0adc3da SHA-1: d5ca46c43e27fabf7a7d39cb514fcd627264214f SHA-256: 54549c2097351dd47843974581de36844797509c80b84bf62897798d342cf9b2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage, indicating a potential distribution or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/0064217066766af56ed6a33baa784a97/40476235905.pdf
    • http://champagne-marc-chauvet.com/images/files/58517562537.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hm23matkqlgtam61s16ckfejr1/74526819228.pdf
    • https://fulzugaskozpont.hu/files/41766878787.pdf
    • http://amsasecretariat.fr/userfiles/file/xafowajejabafigivixugos.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f824551846c8f6c1f047bf001c03b29b/nuwoxobobepanagotoropi.pdf
    • http://edgecs.net/documents/patag.pdf
    • http://bpabv.nl/uploadfiles/file/relolivunujejazivetumez.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ccf80dd4cf3973855c252793db47986c/36713826975.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1981b3eb8d---73725696674.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r9svkvr72a2sb3r6vjdjdbc921/vowitowimaxo.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b8c1df175b60d9971eb87d462d638ef/88877618934.pdf
    • http://accessiblevehicleservices.com/userfiles/file/13281550049.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4789b16678c9d5f7b9fd9055284caa97/3097763020.pdf
    • http://afghansolar.com/userfiles/file/43511350659.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/majeturizarezuvib.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ab183320---75627763856.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f3387bf4---15676861656.pdf
    • https://dolcezzecaffe.it/file/65993034148.pdf
    • http://hzbmsj.net/images/upload/File/37738956749.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0a890e3e---48550149216.pdf
    • http://romangruszecki.com/uploaded/file/rosefuxirozapetam.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/60ea6b8940d4fa1fe52611fb5af68969/6730493379.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f1dd8dca599d29f90897c78694b99fe/nokizutupobugumi.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/98227029753.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9d99860d4881d158f7724dfb6db09660/73854366969.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bf831498b0a---24920718373.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bible+verses+about+justice+and+fairness
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000f1a7.bin
83a9470f304e8d7b75020ab5dd66113c15cbf4b0eeb49173e1176d77cf00a050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16788 bytes
font_01_sfnt_off00011d3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
font_02_sfnt_off00013553.bin
5c00c449d963de764421b9828cf2b17942eaa89889118091a525f76181934227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 10956 bytes

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