Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1035a10bb959d55…

MALICIOUS

PDF

93.3 KB Created: 2021-06-30 09:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4841f69fcbfc2047ca9acb0c14ef9b6 SHA-1: 11cc14de40106662fc8b28256c85426879823a37 SHA-256: c1035a10bb959d554ae51ecbf75be455edcb9e347ff0a7f97c548ed4e1490047
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests the PDF is designed to lure users to these sites, potentially for phishing or to download further malicious content.

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c878720c1c---47843634792.pdf
    • http://bpsstudio.hu/uploads/9413708232.pdf
    • https://dietacud.eu/upload/file/sewanuzumuram.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2s6tskfrffjmthtmm4cg64elq5/muxabonevebipamixe.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160845cfeae693---75401697866.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3446e0060---devurugutadovaxoxe.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0306a8d03c00c1ce070a48211151b66d/wonolemofodimu.pdf
    • http://strahovka66.ru/userfiles/file/mopegovobuvuxowelit.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763eacd11b9---kazokogexukosavuvajovoxik.pdf
    • http://yossy.biz/userfiles/file/dafidojujufiruxi.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5eff089d80962b0e7196c98b88565656/54256162027.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231431e6ff---jebewoduniwuzago.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095740c53b66---bugalujokijefos.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b054080f910---navepidoxilu.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/14270634082.pdf
    • http://daieimotors.com/js/upload/files/xavariwiziwewo.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnmnmk0qf008sal2mmotd08rgi/43277901103.pdf
    • http://mientaytourist.com/uploads/files/52961085446.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013e4d972d---74447942191.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/is0rma1l8r6f40jah5csh76h3i/39365449776.pdf
    • http://elsekmont.eu/userfiles/file/65051684254.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7ef55b17---duzesuvufexisogizifimuka.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/divexesepa.pdf
    • https://bloomeng.com/uploads/72017892183.pdf
    • http://inter-travel.hu/_user/file/34402562079.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41292f166---winusinimibogepe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=life+path+2+and+8+compatibility
    • 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_off000103b6.bin
b1769b87340bb677b84a061d0f0057dd46614b74c95421c9b487a7c6b26f0f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 19676 bytes
font_01_sfnt_off000135a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 16792 bytes
font_02_sfnt_off00014dbb.bin
009291be34c0403ee2409ba31bbf10df3c4a66953d09d384221c24251dba9acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBB 11156 bytes

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