Malicious PDF — malware analysis report

Static analysis result for SHA-256 5437eb5c94009464…

MALICIOUS

PDF

98.2 KB Created: 2021-06-29 11:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 640cf2bca7cf0ea90abe9de35d976ec5 SHA-1: 9d4c1441e2857b58aef34e8ac50e02684aa50dd1 SHA-256: 5437eb5c94009464949912f05a9fb300e22804caf45cac8ba134d4f016f10614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content. The presence of multiple unknown URLs hosted on such compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb79c85995---nilodanit.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19efc76e2---dajomaxokemefexotir.pdf
    • https://egyiksem.hu/uploads/file/49479328751.pdf
    • http://akinmedical.com/uploads/file/romugavobapulinokeboju.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c43c86eee---23827201853.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lbm9n1o7scg4jd75e5m224a7h1/nirutazufilitafol.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fdeb1da4---ralix.pdf
    • http://uticachemical.com/files/upload/files/68435918385.pdf
    • https://bestcoloringpages.com/userfiles/file/39846850633.pdf
    • https://fentesmakina.com/paket/upload/files/10777023468.pdf
    • http://dgjst.com/upfile/file/muvufusomuzelaxugotopexax.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a91bd651ac9d4b0dbf8918a1f913c2/6970731419.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0bee8387afe1cdfb7ff36f63aa5b4cb/wolazozax.pdf
    • http://color-gateway.com/userfiles/file/wiwuvata.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f8996d938f08a7c36f9b0c05fa09229c/97230317105.pdf
    • http://elitaliaweb.it/upload/file/jadij.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6798012ec777f6bba39296352e5a494f/bebojifisinorepopojetarav.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b272e42f06bcb73e5b0cb49978428135/8400138509.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0633b2e4---tavefadogifikizejulot.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8b798c5266d37d71d3624e97971b34c7/monuxopus.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/24679466597.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741f38b3f74---rabumeluxedetokujeteled.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55bb25bc4---94792506730.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7bbbf98dc14c3893efbd71a4a832b012/werezasowegejavavev.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d3f54b57---18586598700.pdf
    • http://www.annaleehuber.com/content_files/file/gadeta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=intersection+of+sphere+and+plane+equation
    • 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_off000117e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 16792 bytes
font_01_sfnt_off00012ffe.bin
b6b8c6dbac1c8ef3fa04ebd2532f770cea2b032a0d462edcdebedb25f2a2dc03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 10912 bytes
font_02_sfnt_off000148f7.bin
ed7a5f8984ebdbab89ef19cd306deb09d406d69561b655e73fb473f23d3200d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 18836 bytes

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