Malicious PDF — malware analysis report

Static analysis result for SHA-256 211809fc363b37fa…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5600ba00b3e0b0afd382b23e75ef4765 SHA-1: 7470a5c1d6d746434bd5fceb9a0cb2323a5a276e SHA-256: 211809fc363b37fa59f35ea43dc2fd323a95f8aadbbbcd201c6fb0726f3df367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=word+with+most+homonyms
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/94ada08c7d5f7395eb7bc7dc6edfcc51/28727004073.pdf
    • https://cottonweb.net/userfiles/file/96996959653.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t1enta6bgfiiq4j8opan3kctj5/73388721281.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a8efd58b45f50cd031669a10454f11b8/sokijupovideli.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f626a9f2e2---36028588897.pdf
    • http://robalton.es/Albums/images/file///godovujizukoxebemojovij.pdf
    • http://waukeganeast1980.com/clients/877304/File/ruvanoxixafovuvawumamasak.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tf5k2rnask5ul7mk6ft7h8pbh1/gazodijujorajitom.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d0bc7822ddec70be34b36cff496d70e1/2310732091.pdf
    • http://congtyvima.com/images/Download/tifokudajuwukanebogu.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeea09dbe3---77195703908.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f4e15f6e---nirofololazeto.pdf
    • http://barksdalereunions.com/clients/869108/File/xefedulofiwekosaves.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b543c6e13d9---wakuzunawegonibijana.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/kdaiup2dv7bh7l9ljoh5vf6qd3/32129775499.pdf
    • https://okna-stv.ru/userfiles/files/15566992038.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875443f4e5---xexoduxolovusiwiweza.pdf
    • https://balustrady-metalik.pl/files/xevev.pdf
    • https://medtek.vn/storage/file/73945774145.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e7ed6ad59463c830038e32f722ad108c/degakikuzitefumojimos.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20b127fbe---41893690804.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4e7e7a98d6d62914f7d0bdb54a33962f/tasikofepoxoxolelifusar.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609413f3cb3d2---besovuf.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91955a023---26120322498.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/xeroxizimurubibozexuz.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adafa012dde---panibolifogifom.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_off00010343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16792 bytes
font_01_sfnt_off00011b55.bin
beb315c4cff9427b94599586240d578810d1e7a87c638d9420228993c23a90c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 20684 bytes
font_02_sfnt_off00015005.bin
7e01dae26f737757665f3fa0e314dc604298389a51de9ec309dabe55b93af1cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x15005 10368 bytes