Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e51f4f25802a032…

MALICIOUS

PDF

93.5 KB Created: 2021-06-26 17:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8afdb0a39cec10eed67fd0710b98314 SHA-1: 5fdb057e16f54fca0e0c822f5127e366b1f86dbc SHA-256: 9e51f4f25802a032b9a5bca48cf814603e402cf037002d6f36c0ae6bed5dc1c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=make+an+outline+and+then+write+a+paragraph+on+one+of+the+topics
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2e53c8d39---rekamanixekurebefogatut.pdf
    • http://pivotal-technologies.com/userfiles/file/90514614635.pdf
    • https://elnativocoffee.com/silver/upload/files/zulefasimojiweti.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cef7958c4---53564673855.pdf
    • http://meble-tk.pl/userfiles/file/63536242573.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qtbeoju1f1g4bc5qlom14cv8k3/87101622479.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/eacc52d55c86155b9a3bf6bdf40b2edf/13616985795.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ce94530eaa12923d518c0be009ba16b4/bokagubidokewonow.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1365be5fe---tewogixan.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/4934621460.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffceeb09e---42360472476.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6j3vjj72muufbr18i2qrqlmj83/fivopuzopi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/83fd30e6163229bec7ab7f042b6f13af/fixolunilemudoliwukitope.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838a484c3e2---xirepirawuvuka.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9ffacf95---kelenoxizovudusilaxi.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bdc7acaad---21698293761.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ed8e797d06d66dcf55f31c92004f14c6/42019845088.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/54f7803b613783179abd689b9f222e28/jivegakarexanovobubudikox.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03759d0---20916419949.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091a6bba15c3---75483283104.pdf
    • https://bandotrading.com/uploads/file/sebolupifiz.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38221c1e7---zekelomiraroxoj.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/lebatagirusuxemodenutevu.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c95e1520c---nunorowotazomov.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_off000108a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16792 bytes
font_01_sfnt_off000120be.bin
2112876719a126e1d882fc3b2effc1de6f385b13314ab8c836f05c65d740b988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 11168 bytes
font_02_sfnt_off00013a9f.bin
1bb4909a01050401d12656ef0eb4d239fc76109921eaf369b69b1298bb1f15e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16724 bytes

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