Malicious PDF — malware analysis report

Static analysis result for SHA-256 4007471b059bad7b…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 00:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89c4e8c6ac3ad34e869370d56bcbbcd SHA-1: 56c05036e805a59c1de2d9085c033bf9447be081 SHA-256: 4007471b059bad7b6280f7bbb34acc09839ed5f0036c2e701eb9aa2cefd242f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/005a0bc6d9666fb10cf2ca925a44b769/71560059509.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m816hdugg8dl72lrrpc61355ao/begiba.pdf
    • http://hourinkan.net/js/upload/files/vedowegobadesazekunaja.pdf
    • http://andlupa.com/userfiles/file/24640918276.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55c38cb04---34847335591.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a579672c108---viviluzuk.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c0f326fa5---18122986844.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee25ca332---77463852776.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/63039160180.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbe270a43---39233954853.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864fd9c8c84---29762333795.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g2o80nk7so84l433rocgaja9k1/vudedib.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7e337aa59---23066777430.pdf
    • https://akapacha.com/userfiles/file/75872456150.pdf
    • http://webursitet.org/Files/file/77372109836.pdf
    • https://edusfera.pl/upload/file/fixad.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2dtjvdv7miu9lvvfnctgr5c6rr/nafofapujedidezenafatej.pdf
    • http://alexlunacoach.com/img/editor/file/wevekebeg.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c0ec9bfa6aaaaf38ac8ffe410f4f083/55301215689.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fbfea62910de480bd47cb858c11b09db/nexonesusad.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608161596ca5c---jabob.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uq8m40e9q2l2e4ou7gi3e3plgh/wetoxipole.pdf
    • http://614move.com/clients/4890/File/11974169627.pdf
    • http://df-foundry.net/d/files/7840288174.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb8276bea---95870964752.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076201d863f7---12570448691.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/i947e70397had6i3sm1b8gi7pc/dezowunumimeleram.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=notice+writing+examples+for+class+11+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_off0000f22f.bin
247053edcc9dd345f86a7130eccb7023254e7bbae27915ca1fd4c71925c6f4a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 17640 bytes
font_01_sfnt_off00012020.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
font_02_sfnt_off00013837.bin
7ac313245d54ace5fa0f144cf901b921b8965642ee6c0e13da5eed598b6f2eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13837 11180 bytes
font_03_sfnt_off0001524c.bin
0ba07f6d54a4cb2ae74247f97c6a926e6d6308299df35fe3bea2e399aa3885da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1524C 16336 bytes

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