Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390d5a3aee5445c…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 00:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45ae2bbe5c15ee5bf8769850d0549052 SHA-1: 7b37a54eec2babc4962acafc1016305d29a91dfc SHA-256: d390d5a3aee5445ca8f54f0d88aa8ef2e188e1a4fb4f03844ab9e7281473dfca
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6b7cb59---fefufebex.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/gicape0iigmp2hov4q0c91v36t/gajugikogirodofe.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d136d0dca---23205845728.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9e3c218d---88560862475.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/sizikumem.pdf
    • http://sahrugs.com/userfiles/file/zabege.pdf
    • http://orhs76reunion.com/clients/30721/File/gamejubepuvurud.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/f443hcrmg39mvs6so6epsh5h7a/pivefebezavutuwetorep.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785920c2a07---velutixizesiveteru.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df72f0dfa3---44443328873.pdf
    • http://skonasystems.com/userfiles/file/doxume.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/oo8illdj4686f4usuvlqjquehc/92427223530.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f08cc2969---ziwitudolijenapu.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7572b6f1f---pirifukekevubaxasar.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/56898504431.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4f1441f5ac51a7d9ae2817f53766f62/toxuvofijasilisagutose.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/90f0havg25r4t2dm5lqtn9imd2/94704517908.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/duxepixupadinuludaw.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160873a0ad5145---36177378657.pdf
    • http://locthanhwindow.com/img_duhoc/files/noginumeguxinuf.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/617uiet9b4llvfl87cnkkupb4v/43860997926.pdf
    • https://jetaime-shop.com/files/wigojuzesiwojuwumib.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2e1a12f18b2d3a2668258116e2e95782/2603643500.pdf
    • http://asja-doll.ru/userfiles/file/fubulamobezizofekekugizab.pdf
    • http://alt-1c.ru/userfiles/file/nasex.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9f92c89e---gedowevewasaguvasosoki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+feel+like+i+always+have+to+clear+my+throat
    • 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_off000103cf.bin
b223c916a5b59acd803fc081db7bc56c7a1342b70ee90b21e66da32216636abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10804 bytes
font_01_sfnt_off00011cd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
font_02_sfnt_off000134e5.bin
b6e4dd6aa9d5142881fbeefdb301c3ed8d6d5587e8a79249ddbac3198d303f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16744 bytes

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