Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b02f8a9757095ed…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 15:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027b78217445e086fcb3373b388fc67a SHA-1: e34e1f0bcc403c7d33203e6a29699e6b3ceca6c6 SHA-256: 5b02f8a9757095edd799f5834ad79b3902e74dfacb2b506af6a973671a450a6a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on compromised CMS uploads and disposable hosting reinforces the attack pattern of luring users to download potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623202940964786.pdf
    • http://nutranghongngoc.com/media/ftp/file/817065847.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77f4cd280d2e0173a4d51993f8832ca5/xululi.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f37d1893a---36874618499.pdf
    • http://findmecakes.com/userfiles/files/84671953544.pdf
    • https://hissekurban.com/resimler/files/taloviguxeraxogazap.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4849a3380c1658758ac2ad31127389fb/32087381119.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c462cb57444---44914083741.pdf
    • http://bulongvungtau.com/media/ftp/file/28001959512.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/92b40e5809a475e0ac2d5aba33cb1c76/7993335655.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cba369ac5b8---muvapunadejaxikupep.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/97d0602340c3454c09933ce593224bd1/powapu.pdf
    • http://abwlanham.com/uploads/files/12471851976.pdf
    • https://motty-etai-sharon.com/files/files/15626047775.pdf
    • https://telewebmarketing.com/FCKeditor/file/58338734732.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6l0qabe7sbehim29svob86uhm5/jerifubuwopore.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6beb40c9c---51798846649.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a63136a5790753f55215000412b4c822/sevulisom.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19b8a0cb0---51760935561.pdf
    • http://sakuragiramenandsushi.com/uploads/files/87659826571.pdf
    • https://hospvetcentral.pt/site/upload/file/xepixikogizedijewomevo.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730792d9b28---bepilatubikikiturazo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=infinite+flight+free+download+android
    • 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_off0000ebc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
font_01_sfnt_off000103d5.bin
029d58e6fa88befda02f655f5c9dc726403f720bb2211d162dbe2f542351b059
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 17428 bytes
font_02_sfnt_off000131c6.bin
a356013664382eafd481559b373c1be83c5c59924eb24ed9564207593873018c
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 10504 bytes