Malicious PDF — malware analysis report

Static analysis result for SHA-256 9750ff300fd0d51e…

MALICIOUS

PDF

90.7 KB Created: 2021-07-04 01:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6829f9217fd479af6f80f74680816352 SHA-1: 85dea8d3773ec32b4a94ebaf25afa7c86fb2d8bd SHA-256: 9750ff300fd0d51ec728f1f9ff6eb3595fa767e7fb520cf1ffff881ae9ad0dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://nomylo.ru/uplcv?utm_term=cognitive+development+in+adulthood+pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adb94f5be23---54062773692.pdf
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a924596735---zadewulesobujifagozaxeri.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cde777cd57ab2fc36fc95d1cacaa368d/51411376023.pdf
    • https://motelandratecuci.ro/userfiles/file/66007698950.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/43033571078.pdf
    • http://gardenofsound.com/userfiles/files/43744204855.pdf
    • https://pasarantogel.com/contents//files/zaleraluwokilamawabefa.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qeto3jjrun8ks7tgkqrnskq7l5/fumujipodemarixaleb.pdf
    • http://ebslang.net/_UploadFile/Images/file/gawelopexanivezuwimil.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc48a246a---rorugofumomewozuzun.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/880339c6f3c6ca3768d8a7e2e5e10a2c/97677909302.pdf
    • http://fine-cottage.ru/userfiles/file/31386260753.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/431ef25c6259c0584de4bc570c803af7/nunesaxiwetozusorugubov.pdf
    • http://fzsvybbs.at/userfiles/file/nutuvejop.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843793f7c---67466631676.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865caf395b8---13065803417.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/3458553158.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac713a59e7---vanobomowibezumananobezo.pdf
    • http://nitexprofi.cz/userfiles/file/28995483781.pdf
    • http://bishnutoursandtravels.in/userfiles/file/gadetosatupuwaguboxobolok.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998bd805f0---79654423399.pdf
    • http://scales-center.com/shop/fck_file/file/xibusupup.pdf
    • http://amandamaitland.com/images/file/nagagafulobilirefobofu.pdf
    • 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_off00010214.bin
e936cd7a99e564294b580cc1e9164ff4bb922d9c0d63b4f3d90168fc1e698f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 10876 bytes
font_01_sfnt_off00011ad7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
font_02_sfnt_off000132e9.bin
425b1d09494986e37837fa68472df68c5003bf7509d5c6e91f9bd07c991d5fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 16420 bytes