Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f583f6623b7795…

MALICIOUS

PDF

86.4 KB Created: 2021-08-10 04:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54b5b50bd97f203e6f69aabaf860c67c SHA-1: a6beaeb162ca7912f8054f48d7c52ac9eb43f2c8 SHA-256: f9f583f6623b7795bd642157ea58b0291119044f7ba472cd4697444594089879
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=adios+nonino+sheet+music+piano+pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4c28d614---ruselaxi.pdf
    • https://ewt.cz/res/file/59257454019.pdf
    • https://accuratesearch.com/userfiles/file/vuvuxavidedil.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acafe725de7---xezivokutamuvizupalebij.pdf
    • http://lakehighlandsrw.org/clients/863582/File/58812674860.pdf
    • https://classykitchen.pl/web/uploads/files/29114740793.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/385faeca58b4ac93d1c771a244b7b544/40449176805.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/t8muo9kprfvgrccqmc1d2ufqrp/jinamanafagaxajop.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ae5e7516b529b6b63a6cf6f66bcf4f93/97545394801.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f380cd---72823062899.pdf
    • http://serextion2006.com/js/upload/files/93696589877.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c788790a3---dimejuzavejanaginage.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089469c6749e---vexekakitomal.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/jusufugepazupogu.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1d190b99db3ca4d26220178abec407db/mufugenilakazawufefuj.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de67c51168a---pawuzo.pdf
    • http://legalinet.eu/userfiles/files/jenuxidadaxudibuzuwifo.pdf
    • https://adasms.fr/userfiles/file/55019672098.pdf
    • http://akicgiyim.com/userfiles/file/ladodurupasabamaxoviza.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a281868a2ae---bixomijitosuxinuxikosipal.pdf
    • http://martonelektro.hu/files/file/tesefali.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4bdb49f71097b9524dadfdc03f1e996a/46825411765.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/98372167123.pdf
    • http://madmojo.com/fckupload/file/sutipojutudefimupuw.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q0earledjciulr3a8b6n8bqqtv/72462675700.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_off0000ed4f.bin
f9a7f142e3eda25b61af266ef5888b322c4a240a06de6fcef6929ed86efdcd3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17436 bytes
font_01_sfnt_off00011b38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
font_02_sfnt_off0001334f.bin
628b9d78c11c052f22281e5b6c20966ce873f249e599931bc2dbfd3756223bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10820 bytes