Malicious PDF — malware analysis report

Static analysis result for SHA-256 4890a4cf6bc27441…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 22:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf9a3a155799c04ee894af0899b5e32 SHA-1: 719f6a56d96092cda6bbd7fb89868d42ce55dc26 SHA-256: 4890a4cf6bc274418803a4fa8263e5900c870f457e703045e967313148123281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mho62q011dr7i53jomgbr48a1/vuxiromivube.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2304bf2e---79374721357.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/25cccbget8le9ebi8g2nl97kcs/33075494235.pdf
    • https://melz-feu.ru/upload/lixizorimawafota.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a47u9nalkk34mtcl51h6f9gjq5/57012903697.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/29du8sodeodn598mk5k3nallhd/53751674096.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/i3j3i8eg5orcv1s5s2sdo1kuq4/jiruvew.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/71bb3217ff92ba120b42da94e72849e9/zawifuzan.pdf
    • http://alliusie.com/userfiles/file/92413895417.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2289dfaff---31830461671.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d9c3c15d---nobazezetok.pdf
    • http://caramelitos.sk/files/pedixok.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipf957rkn9u5a89v68obecg8l0/fusumalipigogajimilujibuv.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa70ecd02---madaramozixajudir.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc4e57ca3---87384247095.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa50139481---63839477320.pdf
    • https://danielstrehlau.com/userfiles/file/fibomu.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c76e71f80c0ef1440827a1715b363f49/fufurimenakiwa.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77f4cd280d2e0173a4d51993f8832ca5/xululi.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/84192e2ec1a9e1c8c441aa1d9425156e/2251610297.pdf
    • http://pamat.ro/UserFiles/file/palowilufagekagowurisotus.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851acd31b38---rejodo.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/92323e608d84925c3557c17555a12244/60279852924.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=convert+picture+to+text+art
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb91.bin
9c405e5db1690a1302d3a5631fd0f9d908a18dc8bf55e2580615d060f2954460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 19204 bytes
font_01_sfnt_off0000eb76.bin
944654673ad80118458c87f7abd93d0a3dc0cd30627b839d124da5c2604d0af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 19384 bytes
font_02_sfnt_off00011eea.bin
a30d2e39876815d368c449cc5c58ef0666af7971041cf87342da6fc043255215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 10452 bytes
font_03_sfnt_off000136d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 16792 bytes
font_04_sfnt_off00014ee2.bin
cbe0a85342fbe46087040dfab7580dcae1225f91c858ca92f6cda475f600b567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE2 2056 bytes

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