Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84b217b65a327a6…

MALICIOUS

PDF

82.4 KB Created: 2021-07-20 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 088e19177a0f580c79c78fb907c000b7 SHA-1: cdc43f0c615c7ebf098bc5b05c7cc7bcd9ecbd45 SHA-256: d84b217b65a327a6af1f39646893a49fea76cb7f36dd86dc13af01e839955bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content via search engine optimization. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier strongly agrees, suggesting the primary goal is phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b52fe002000dbcc4489253d814fbf665/17049363985.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a8e7299d328d51cb0c45b579d4dcdfe6/muloditatuxudop.pdf
    • http://www.asslar.de/downloads/rojelesek.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b6179df---73943804874.pdf
    • https://educhina.mn/editor/files/74305696879.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d3380932a---52622364172.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/k5qqrefugr9nne8kf5nv15fu1t/lowukugirujufararoxu.pdf
    • http://terralis.eu/catalogue_dynamique/file/48449037793.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d28d1e01---pogozufevimarolelusuw.pdf
    • http://ceskylakros.cz/userfiles/file/93798817374.pdf
    • http://copy2d.com/ftp/image/file/77698135500.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/pogibemusakipu.pdf
    • https://kurtoglumob.com/upload/file/6891694442.pdf
    • http://daydala.com/userfiles/file/mizurabekelukepesogipefag.pdf
    • https://bucatariizidite.ro/printuri-fi/files/fudaxuteparaxe.pdf
    • http://obasekiestates.com/UserFiles/file/97049067281.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b10bd6852---3282297760.pdf
    • https://rimsball.com/ckfinder/userfiles/files/39204666718.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/26e337c04078d8b358d79f23b1eb3ddf/79328351653.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/41843132268.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489ece4341---10409691435.pdf
    • https://gamma-electronics-eg.com/userfiles/files/wolelegawisafixelaxevotim.pdf
    • https://lecormier-menuiserie.com/www/upload/files/wozexez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=putty+tutorial+for+beginners+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_off0000debd.bin
1820e66842865d908ce596755301ed526ac9d78a07de26b6c49d27412c40922f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 17052 bytes
font_01_sfnt_off00010af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
font_02_sfnt_off00012310.bin
eac0cde9515f0bcf13fd657357cfd670a0443becf84f74e3d16de97b3e69d105
pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 11028 bytes