Malicious PDF — malware analysis report

Static analysis result for SHA-256 219df58f12b1c1f7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-30 19:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b89275d1f00dad46b2313112cdd12ee SHA-1: c11a74c495f2e93d5f0072b9d9d9ccae4cb6ad8f SHA-256: 219df58f12b1c1f7eeaf1731d61cb1a701be75c4c60cafa8e458761237654e1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coebmsf.com/userfiles/file/97650377847.pdf
    • https://ctapigroup3.com/contents//files/jiwakepududuwobenutuzap.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/33de95009c166ca658e67beba9ffe414/fevamosokumid.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98eb511e0---71516564629.pdf
    • http://posekatzahradu.cz/files/file/90924017733.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9b2f9f827---31584822100.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/86109141b0cbc612e2af486bbcf56dbd/88624731511.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/441093f448d60a7eebad1d685765ba6f/31632653355.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2d2a3bedfca8f02b495115005fcd8994/69272049461.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/19b78t5goi9p60p3neotsnqp93/vagudafutujopejukemadoka.pdf
    • http://ketoanaca.com/uploads/image/files/bezabigipikivezemoga.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c10005bfb95---32669693721.pdf
    • http://phpirateboosters.com/clients/867602/File/29994760553.pdf
    • http://dostavkaturov.ru/files/file/xavatuzize.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f54cded8c9d---mibipebax.pdf
    • http://aaaexpressheating.com/userfiles/file/74194966341.pdf
    • http://beergolfers.com/blog/images/file/10149247707.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dd79fee3---mugotovajag.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021652142197664.pdf
    • http://dh-life.com/ckfinder/userfiles/files/zajural.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892b52981e2---79011758155.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/6ab26cbho8gjj6or9lug1hlhoj/ratusosoxuruxukuz.pdf
    • http://stolizstekla.ru/userfiles/file/donubaboxowetixilige.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=geometria+plana+exerc%C3%ADcios+resolvidos+com+c%C3%A1lculos+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_off0000eb4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16792 bytes
font_01_sfnt_off00010362.bin
7d2204112a8b62ee37b3786b3bc3b7791e46403740cb02389f32388353378d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 11332 bytes
font_02_sfnt_off00011da3.bin
3e8fdd7135fcd8fd952b987a29e1e76d77f531336939bbe6616e9af11fb55cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 20040 bytes