Malicious PDF — malware analysis report

Static analysis result for SHA-256 095d6d54fa581eda…

MALICIOUS

PDF

79.2 KB Created: 2021-06-28 12:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b043d6e35a1a46b1266dc1bef45df34c SHA-1: afda1aabeb6f8ca627b71e1d9c31ea842496f031 SHA-256: 095d6d54fa581eda89e6be51746e9e313e3e19c44063fed6b333c555a4e49758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://clinicaveterinariamontecchia.com/userfiles/files/3023847135.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b537112812---96282173792.pdf
    • http://fatamorgana.fr/uploads/assets/file/60489642934.pdf
    • http://volamtuyetthe.com/userfiles/file/78346395424.pdf
    • http://asea-admin.com/_userfiles/file/20210505200550.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160909b1f8accf---mefezakebezorudejifumeze.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b18649239ba---10337456021.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89dc875ffc1ed5d69cfb16721c2eb440/1628490121.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/846dbf728a5871fae3b60f6e3d85abb7/83299202923.pdf
    • https://rowadalbyt.com/userfiles/files/teginujozesazisagaju.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ecacb0aa9---bogomebima.pdf
    • https://emilline.dk/ckfinder/userfiles/files/55181450857.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078563e757b9---bivelemikipidaboko.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/wezamipulovu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a80032f49---66739900691.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/431cc9eae166454522a496c75be7a046/wexenu.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/62260719092.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/mefowuzu.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f9b0a6e9146f92005865c469e1fe6f80/binafune.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c8527df5ce0fd1c16e1ac91ad3d36d76/pagotizilirikazopufujop.pdf
    • http://apsencollege.org/test/fckeditor/file/luvazisozesi.pdf
    • http://mini-garden.ru/userfiles/file/rijerojuxadetuwa.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26fc123f29---54903926511.pdf
    • http://sosnovgeo.ru/userfiles/file/webijosanowifusijimune.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ever+never+already+yet+exercises
    • 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_off0000d2d0.bin
84aae738a631262b094cb5af8ba8728bccff8193836623e95007eb5e7b16abfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16620 bytes
font_01_sfnt_off0000fe0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes
font_02_sfnt_off00011624.bin
8038bc7f1b0253625047939c17798561b8829d3a890655556683a7e7375a2961
pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 10508 bytes