Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ead692d67a7c25…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 15:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 594c8e880ad0b102b647b03886a9f6b5 SHA-1: 9efad64dc23efa9a62257d54671d38eabd0a660a SHA-256: e5ead692d67a7c259b629ca9c2b4149512934e71b862786e91211d2b745007df
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e93b7896d32373c87e5b3a4168cb901d/18235724117.pdf
    • http://tantos.jp/js/upload/files/wegowipodanabojusijiwim.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a33f9de7a---32307654733.pdf
    • http://cathugo.de/res/wysiwyg/file/97752606716.pdf
    • https://summit-christian-academy.com/scauserfiles/files/40039427447.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b37327bca076a86e45c57c96ae468aac/12020759306.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gs54utpfrh5qdhs2p1i2sgh9u9/27468157553.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8137b3ac---winilubopuxozaxeliniv.pdf
    • http://mobilesamara.com/img/files/file/70729757754.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fgonib5kmp8cr2ummlut9mbau5/88747869261.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc1c55478---wepivasaneg.pdf
    • http://www.cafeinca.com/img/public/contenido/file/42119281889.pdf
    • http://bmsorganica.com/userfiles/file/molowuzujop.pdf
    • http://steakclubhn.com/campannas/file/weguza.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/01ghget5m2lmgkeptv32ecfi6c/famotagebewiza.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjgggv4vcndse588vsgrtjfh2v/guzov.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ddce20f3---xajarikazabakiganivirazir.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609455e5e89a6---83480276640.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/kegadimexit.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8204a4633b77ee02debd19c150c64ee/verizifilav.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58f8622ad3e3317ff79ebac38f0d49f1/fejotefapusubewijigar.pdf
    • http://pcccphucvinh.com/upload/files/67653933784.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedc7096c6---nirababiw.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4966148cd0829a1ef34656765b010360/55164871508.pdf
    • http://scantech3d.com/files/39360997284.pdf
    • http://getem.plfiles/file/xivenebizeluwaxipap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=does+high+temp+cheese+need+to+be+refrigerated
    • 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_off0000d60c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16792 bytes
font_01_sfnt_off0000ee23.bin
ffccac8859ff595f27dc515e2a6111966f08190c6c3ef7f9d4b42b607c4d0cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 11160 bytes
font_02_sfnt_off0001079f.bin
43ca4f70396d1b622d1a3eb9ee08b08489bcce9a0d0ba504d17e6c1ba37b4af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16532 bytes

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