Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c858583cba2509…

MALICIOUS

PDF

93.2 KB Created: 2021-06-27 07:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 186d9e5b0c4ce32f6936cc6eaa0fb9a4 SHA-1: 70fe3b92c0d18133e543a64677af76cc113e3daa SHA-256: b3c858583cba250940149d49065e1785e92da598dd825bd26f51524e050969fe
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous links pointing to websites hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://kagoshimakojintaxi.com/userfiles/file/wapugodo.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dd79662970a5cd39d99300dd2857a55f/23480985251.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2lladfa7rp66dmeud590ffrb8j/60834010744.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0ca831e72d4da49dbcecf0fe5cf99cea/norabowu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828de8c488---xexebutope.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/remekixekirewejevir.pdf
    • https://loyallcanada.ca/editor_files/file/89542221624.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f3d65dfb0b15b2c3acb75064b20ad41/49051245425.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba252f103e6---pikikuwofuwovewe.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ee8d1c2f7e2057cb61b4e9519a687bc7/73934457668.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/bapufewumofopekomejixem.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/reqhpqfkqmd1ttmisq1gg6h60d/68543343703.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/budezodo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfhfm1e0ngg2oamupu2f3b6d45/73783057429.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/q35p4icvbi2q3ionrr50pi58rf/wudunerovotizezafizi.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096680f3d29d---mofazivesones.pdf
    • https://bouveau-consulting.com/userfiles/file/fevepuvapufaxipegode.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pflctl45312bkio3vi8kqb3n7q/rerulokikeju.pdf
    • https://afayl.com/userfiles/file/savibux.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kqprnmjm8hhe8b62u7jqm20v5s/59710714573.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/787d84dd982ae38ecf5b1318ebb4afb9/pajuzaredipojaj.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/pozubofefotiv.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/56ecc925566be89eaf093ec851cca56c/ranirujelox.pdf
    • http://quick-thailand.com/images/uploads/file/vemifabezame.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=top+biggest+airports
    • 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_off000102b0.bin
8d9e068f81930090fab35ec35b761be71375404b4fbdf04df4c82c25172437da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 10380 bytes
font_01_sfnt_off00011a1a.bin
25f3ceb63cd069fdc3134593e773a101bcd1816eaa27586e0d96d2d1f7d0a5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 16760 bytes
font_02_sfnt_off000145b6.bin
cbf4e420d69f6984989f730c019ddf33f4f535f71551d3d494c5d00c4fc4dc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B6 2040 bytes
font_03_sfnt_off00014f08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F08 16792 bytes

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