Malicious PDF — malware analysis report

Static analysis result for SHA-256 486b7c8f8d20d532…

MALICIOUS

PDF

83.2 KB Created: 2021-07-15 20:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72362f6ad14ebbadd4451800d9ae05f5 SHA-1: cccf0cba4cdd4e56707da4c80c15061c3d92e06c SHA-256: 486b7c8f8d20d5327d981665b76da5fb14ba7b619abfda8d2a4afa8414908b87
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of malicious intent. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination and potentially distribute phishing content or malware.

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/072f4eaf8cd476b0e48d976930ed21d8/828553493.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac247ab027a---22838922014.pdf
    • http://botosani.ro/img/uploads/file/newumelugularijita.pdf
    • http://jnafarms.com/clients/864068/File/20197030059.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bfb589f6a---perizuzimixebakomutinumak.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/tuwerolamit.pdf
    • https://istanajp2.com/contents//files/69895109501.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06da2c04---lezemutazoludegewa.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609209be179fd---78932848121.pdf
    • http://detikakdeti.ru/img/file/18703598761.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/449631f0289250fdb5ffc2d98d06496b/dosixapogufekezevufilun.pdf
    • https://gachbinhduong.com/upload/file/rexopox.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2f8d5d322b3cf35e21a458a1f42803a4/77420591011.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/13558cae0915c0e44e867c91938283a8/82290963590.pdf
    • https://monyetmesum.com/contents//files/dewuwuxuvivunemovozafiwu.pdf
    • http://alarmy-kamery24.pl/userfiles/file/pogego.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982c2b3a1c5---karuxekate.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d462b27d190---dopekajujisosoxixexexeb.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609220570774d---47394106560.pdf
    • https://asiahijau.com/contents//files/gukepitaxekevobusifum.pdf
    • http://autofulltravel.com/userfiles/files/jedoj.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6b320de1---90658146530.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chest+warm+up+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_off0000e3e7.bin
3b9e0bb09dae780ff9554327b91bfe48ef17b9d84b6de27c842fc88cc270823b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16556 bytes
font_01_sfnt_off00010f10.bin
daed4243b7a4edd47ba820f8e4c5a4ac416e95d4f5c3dd9ab03329add0640fef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10688 bytes
font_02_sfnt_off000127b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 16792 bytes