Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a617b885ba4b930…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 10:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9da3c78e07130cc89ee8806b7ae53d7e SHA-1: ca7873ea417a4a41d8ebe902cfd0b54db8bf959f SHA-256: 9a617b885ba4b9307ace173cc038f6bb51bde494bc498b8a85ac64686d854648
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prakseologia.eu/userfiles/file/39339781003.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/44048909863.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/kuwibizif.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353b353d3c3---3366338699.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/sulixokewexagubivewagogiv.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324c9e8f0e1---nazavesoxukenokusova.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wamoxovuzofuvaz.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/20549819661.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613406388a7b2---70424443757.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/upcns5m3ublo7bvhe61pto3cd6/fasedijoboxofudogu.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rexunejinusivatimo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • https://adikkedua.com/contents/files/barijixamutuloxidifulolo.pdfIn PDF document text
    • https://heureka-cz.eu/files/wepawurix.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/zidute.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/nuwixatolatigive.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/bugelimuregusomogenu.pdfIn PDF document text
    • https://austarpharma.com/upload/files/94387498464.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0f4a20ef---teramugawajo.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/neloronafuju.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vaneba.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/2655532709.pdfIn PDF document text
    • http://mfahk.com/upload/files/27377350332.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/diwaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+2k13+for+androidPDF 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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 10472 bytes
SHA-256: 063703b010d37d08e93af60a9d6967fb844c1e6bc6f2d3fe3d86ffc0ca84998f
font_01_sfnt_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 14252 bytes
SHA-256: 9c81ece6844e984d346df0fb1f593648c87f1f82fd64da2bc0f5542a7edf75b1

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