Malicious PDF — malware analysis report

Static analysis result for SHA-256 2360335d4658cbc5…

MALICIOUS

PDF

71.7 KB Created: 2021-07-02 04:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f13fb6b8deea11b04162005b2b7d7016 SHA-1: 8b2fddb7b76fd50e4fb6031e54f17dd5d8132b61 SHA-256: 2360335d4658cbc501479840e80604c549a756961b225795f3023f3d3bd08501
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links pointing to compromised websites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of multiple compromised CMS upload links further supports this. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=animals+and+young+ones+worksheet
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160865139de381---wipagufusojeloniv.pdf
    • http://chaitraglaze.com/uploads/fusaponuxow.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6c532b2---wazurawojiselo.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a923e0c0---45116091038.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/leldbrg9bk8anddhdkou3pq7ps/nadagetedulejokamilukove.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vimowifu.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd227fffe---80569302533.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab75871bc---gazonenufojoxosulazademef.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c09d3181---xubifaxevonogegemokotepub.pdf
    • https://kovosluzba-praha.cz/res/file/40947249119.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dfd8d219c0557e94b422374c5c018364/58574189837.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4262e1e3089cc21a503ca62e55d4ee16/tobojojaremufena.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a881efe5addb89dc06a6ec4d1bc072a0/91221387360.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wiludojakotik.pdf
    • http://asbu.net/uploads/FCK_files/file/21272982715.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i846amf5ccrmsneq0kgsd8qiqv/28367804042.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c600bb35b51---11212151778.pdf
    • http://matstravel.ru/userfiles/file/34982725568.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6356917f---19225075187.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609864168c16a---12871561130.pdf
    • http://mobilesamara.com/img/files/file/26374139764.pdf
    • http://solmoda.it/userfiles/files/jepasotavalovurixaganofav.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_off0000b916.bin
a4b5796e50f3c0bba418083a1250e58ae0e0e82394f911be77a0847b7a6a26ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 15188 bytes
font_01_sfnt_off0000dfcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 16792 bytes
font_02_sfnt_off0000f7e4.bin
3867c6d8d183b6093cb3508b9abc941947e8b23842b358c3d59ba16de9c4cf91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11068 bytes