Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e245f848b3f17…

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 06:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b71d201cfd2c62e5918d702ae2a38367 SHA-1: 14dbaea50e851a22069060926794652b9c6c4aa0 SHA-256: 171e245f848b3f179577859246272b6bbee450ee321590959773463b259da33b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable domains. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to serve further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=past+perfect+and+past+perfect+continuous+difference
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5e6e340df7cfc5ea0b3da235bd5a1c6c/27004888412.pdf
    • http://thermcom.cz/userfiles/file/lujewadojavirozifudutojez.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae256bffae---72161290539.pdf
    • https://h1t-urlaurora1-turbo.com/contents//files/poworojalasama.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772c2de16b8---15818499092.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/beb3cfafe2ed8be519d82dfead63b2cf/lefewujekovizitetekonaduw.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d4c0ab3792b903af86dc90ac848c54cf/67350501278.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ec30015ee---69467330170.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe569cc1c4---kejojo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0748eb4ab80e0ec3e1fb27667ea22ec0/ridibanuriradujobojar.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e468497bc---volelodovonowatajigoja.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/66418738600.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9ea092f9aaeefd19f0eecd1bb13b291c/54339102446.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607487c82dea0---ribiliso.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l569h6qimsite4kqnsa39rjbrv/mutazilugasok.pdf
    • http://perlawarmii.pl/userfiles/file/19348750.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/11905368795.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e65951850bb---lagarukavuguzem.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736a020de1d---tovarevejaxomamanogumexek.pdf
    • https://vibanghanoi.com/uploads/files/favuselotanudaragaxopumu.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7460b9269---xolefijajetivofikesiruz.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/83903947989.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de07488a937---ruruvi.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099e24ed9b84---24703782329.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23a.bin
ba265285ee4e0102eebb209575d9c7f7e81e8f2162a04d8c053a0068ccf493a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 21956 bytes
font_01_sfnt_off000118c5.bin
470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16352 bytes
font_02_sfnt_off00012ecf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
font_03_sfnt_off000146e6.bin
a1fe41e659a5fd76da2419cf0ebdad7a1e8005453a4a71ff5dc5a1285cbb37ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E6 10668 bytes

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