Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e1b1d22835ee93…

MALICIOUS

PDF

88.4 KB Created: 2021-07-18 00:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40583e736503b6abd7d8808c5f38cc1d SHA-1: 020c72ec9d2f8ec41d92f2b7c340cbd818657626 SHA-256: 90e1b1d22835ee933b37d23aee441097178423ce8382a34e6f95b4ffcf2bb899
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f86945e2---93314464120.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082809159ab5---repanukowade.pdf
    • http://deltastal.ru/userfiles/file/nexozirawij.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1ef8aa3aa333bda4dd21d949499e0bdb/99634072629.pdf
    • http://ibshop.gr/uploads/_uploads/files/sewumigelose.pdf
    • https://anakmeong.com/contents//files/98032518872.pdf
    • https://hgb.se/filer/file/63346618161.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01f359de9---31985147837.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3f58926d---gipijub.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4265572b9ae8ca9da6d84e48421ab379/penopiwasikine.pdf
    • http://autosoftware.company/autoresponders_images/files/3662680780.pdf
    • http://tikatalog.sk/_files/file/21111345371.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ivte7ljk9r7seh52i0keuvdb8n/70303040648.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ab54d62f---78918830257.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7650941f---dibugunogibegidaturin.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e5ab855677977c14f96628c166d1c43/vojinuzofosik.pdf
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/dimegekudiloxoxuwamuje.pdf
    • http://abwmarlboropike.com/uploads/files/tokito.pdf
    • https://augsburger-dartliga.de/uploads/file/49204116884.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a3b36f23d9433504af47229aea599e49/wokoxebaruwubaminaroj.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24937bd6e---fimalerabe.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/t2f77ajtiublf009ofmq8otunt/12743839162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=love+our+labradors+by+the+lake
    • 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_off0000f3d5.bin
7c1faab310a4e917311839d40cef88075fe46ddeb918157164ea6b5bfb20c947
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17724 bytes
font_01_sfnt_off0001223d.bin
4ebfd1fee7401e74fe2bdaeb7bacf1a25d6d6ca30b5873a9a5a7635fd99df1e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10616 bytes
font_02_sfnt_off00013abe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 16792 bytes