Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e3b845e3ecad59…

MALICIOUS

PDF

85.7 KB Created: 2021-08-11 17:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4190639757d2109bc0db6c13f0c16d48 SHA-1: 6a4177a0d33a6d9cf0d606349fe1e55bc9ca236e SHA-256: 72e3b845e3ecad597352ad1082dcf0c27cf9ff875f456c07492717d73a61eea8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://mrbossamktown.com/uploads/files/rukanobavoduweleve.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/moranirupusuvemoxesofub.pdf
    • http://beastyenergy.com/userfiles/file/38743468248.pdf
    • https://cbconsulting112.ca/userfiles/files/bapakewigigavojiwupeseko.pdf
    • https://autoteam.in/ckfinder/userfiles/files/26464848099.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a83dc00f37d---gaxudubotogipudoridaga.pdf
    • http://thecreditcrisis.net/clients/73966/File/41053190462.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8euk0d3rliud4fp0bj7qn55e7/26695191774.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/2343314675.pdf
    • https://vili-al.com/uploads/wysiwyg/files/68661316944.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/velamafuxexoruj.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8a182332c9045452c7a588a8148a0540/bomabudatowipubaregupif.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d417119214a---wawelabegekakelowu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073075ce6eff---mivagawagi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1edkeisrdjostmilo5b12kcdc6/woretifi.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/mazubotunexipatibofokap.pdf
    • https://tpk-m.ru/files/file/duxalalesotu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b654b3f07---95670975146.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609afc7ce5efe---45062755353.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dlcstbjr2771d2nephmeo8vufk/80730707186.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/71461635640.pdf
    • http://machin.kr/userData/board/file/79386118290.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc694ffc6---xikapumuje.pdf
    • http://growourworld.com/clients/83159/File/jirerubejokumuluxupakif.pdf
    • http://ilpeace.org/assets/ckfinder/core/connector/php/uploads/files/31574070710.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=food+taboo+cards+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_off0000d674.bin
7cd650be26d854cfe21f1f4aada2ddbde382329d501a276ca3f46bbc947f3b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16120 bytes
font_01_sfnt_off0000ebd4.bin
989ceafecc626923835120f0dbea988945ac654598f73dce03eb4845ae38685f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 17104 bytes
font_02_sfnt_off00011883.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 16792 bytes
font_03_sfnt_off0001309a.bin
6084d050f692610d220021983f1bf47d69667b3a6fa9e7403e946e5f24e95892
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 10356 bytes