Malicious PDF — malware analysis report

Static analysis result for SHA-256 092441befdace535…

MALICIOUS

PDF

94.4 KB Created: 2021-07-04 20:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c7cc44faeeb26a242f133f9236e1023 SHA-1: 2f848c8a82e78f1b090f5f6625e8d571195c0a44 SHA-256: 092441befdace5357f98a290bb56133f2aeea98ece0ca7625bf5a7b2daa5d579
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to download and execute further payloads or exploit vulnerabilities. Additionally, numerous links point to compromised WordPress upload directories and other potentially disposable hosting, suggesting a phishing or spam campaign designed to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mosvag.ru/img/lib/file/zajodagolurasoradenatex.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b67ab86f1---93239720932.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae276862b45---70879117322.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744a98361fc---52863501754.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160851c2da923f---26727331663.pdf
    • http://pphu-joanna.pl/fckpliki/file/bokuzagatoxorujekuwoxe.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f5a91d1---56097539836.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8da4c240d---70173773992.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d05215bb72f---77742201846.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609820638407c---naximegozuribavoditug.pdf
    • http://rainbowcaterers.in/userfiles/file/zedobugududozip.pdf
    • http://hud101.vn/webroot/img/posts/files/81413329894.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e4340fe1---43153605219.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9ab91b5c54eea0bf7fc6d31af2117865/powodirujefefududev.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3663acc700---61214390944.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57659855144.pdf
    • http://ajtoablakcentrum.com/_user/file/99570827561.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2599d31a25b160eed429896ce563e731/66656287460.pdf
    • http://bjsprt.com/uploadfile/file///2021052113442747.pdf
    • http://tuderprogettazione.it/userfiles/files/dipefip.pdf
    • http://gidaero.com/upload/fckeditor/file/pilazag.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9d80b3d9---9626989038.pdf
    • http://capital96.com/userfiles/file/45361812274.pdf
    • http://tsutae-f.com/js/upload/files/90788637598.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c760328cc5850ccc2125347af46403d8/dekod.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/icr9gd04o2e3v2jp6lrfb1eidb/85506081141.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+can+an+alligator+snapping+turtle+hold+its+breath
    • 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_off0000f878.bin
24e1e011c7bc534f4c690ffc51fb8d17c103a535931130af8abd2207292a116b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16676 bytes
font_01_sfnt_off00012390.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16252 bytes
font_02_sfnt_off00013970.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 16792 bytes
font_03_sfnt_off00015187.bin
4bf4c1634651345a5e66b6c0682cfee135ffe3c992a31e87867ad2f2c19605f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15187 11112 bytes

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