Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e86a6f05908a2a3…

MALICIOUS

PDF

94.7 KB Created: 2021-09-07 15:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f315fc6956833553b285e6a6f9d9591b SHA-1: bc507f7b71d3ac135fdb935503c74a09616ceb29 SHA-256: 1e86a6f05908a2a3f39fc3becaa97ae9cd324c5d7f8de8cbc3fe1219d4c869bd
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://picinterior.com/ckfinder/userfiles/files/korisofebukonezufejoxejov.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/55e658a970f65c49f69a342e7e8b0deb/gesifofepafuwejowoguzaz.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/02t72et05n6urqe5lvhnb93df7/xopil.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/91533909164.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wodamawut.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/katipuxegum.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/2580571074.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137556a3b46e---78453917521.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pudijinipaviwike.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/64456772326.pdfIn PDF document text
    • https://motacademy.it/file/bafiniwufanazatizoxip.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/sr1lmr08eboeg576qlduvkgfc1/18415027659.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160755e8fa940f---54100966361.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/wiliwufinuzadoxosoka.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/lagipasoxubazonimalu.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/49794383380.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/79a9bda6d49643955d0e00702f55d3e4/47653330263.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/23fd55bad543400be6c02feca72a07f5/pufob.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/lubimuxomidupaxa.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/bagoveresozegetabiberi.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/u1d9o5b7ld52t1v8f9rk6l57u2/36563476769.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/lugofavilokinofikajisumu.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/xofesafegawibip.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804f37ce5c8---39348806137.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160af86a64ed11---77771197962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fuels+furnaces+and+refractories+jd+gilchrist+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 11192 bytes
SHA-256: 4aa4d77cebad2da7cb79bfda81cd72cd9c7e68d6fa8896060207952ce0b7b8b5
font_01_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 18148 bytes
SHA-256: 2f1c76db08021b26a220cc23d5adcaed63a9cadd979740d57ebd36f5334317a3

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