Malicious PDF — malware analysis report

Static analysis result for SHA-256 05256ada8bf967e9…

MALICIOUS

PDF

103.6 KB Created: 2021-08-10 14:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7ccdc73b6f618705bd0fcd6203572015 SHA-1: 4ea2b5bc68f41bb42fd2a218d113ddb22448c6fa SHA-256: 05256ada8bf967e9cb8cb6b2a2afcd3c454d2da7cf031476c0639136d39287f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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 http://dogoxuavanay.vn/uploads/files/16310575644.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c360d21292---sasoka.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871546c3d5---92304710815.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ebr4sds1pi8u0rebu1emlp918t/28589510687.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac749ad148e---874090161.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tegubuwudelijivowawuta.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/fixelaxomo.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/relod.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53de1d7ed---vowowidaxuzezejureleni.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8872c681a4---puwel.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/50879388612.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/90814876048.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/79576691198.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lawuzuxamutiwizo.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/lopimowekefepoletixakiv.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/5604759537.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/zuxabana.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210719070423239796.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607399a98c3fd---bakorego.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/kerobunaduno.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/50353652671.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e842060128---sararojunizagarug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shimano+xtr+brakes+vs+sram+guide+rscPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 11344 bytes
SHA-256: 983668190af514056a44a9a2f8f19e23fb5460a0cab2460db70ddadca7994679
font_02_sfnt_off000147f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F3 17884 bytes
SHA-256: 2204ba6a1a7748ee9b73b045eea7a002876225d08f4bb3265c23368b09c9ad8e
font_03_sfnt_off000176ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176CE 16580 bytes
SHA-256: be542cb73992d00f44670ce00cab0d4b4d97e1d487c47098fc7b313bb0d26e78

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