Malicious PDF — malware analysis report

Static analysis result for SHA-256 4481f1ec865bef82…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 20:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e33231a1160f518d146c6bca4208559 SHA-1: b576824855fcca300b6b0db3131533a3af6a6e07 SHA-256: 4481f1ec865bef82c62f8bcf04e561271e1a910f9dc8a246ca81524e5960fcc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=estilos+de+aprendizaje+kinestesico+pdf PDF link annotation
    • https://tatsolarlight.com/uploads/files/99806915007.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/95837757368.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/kemosijizinew.pdfIn PDF document text
    • https://area5srl.it/file/55950380573.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/328697dce5cf1dd52db5400fc3ae365b/24186171716.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/dufavate.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/godefu.pdfIn PDF document text
    • http://ridendo.cz/files/file/17149050045.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/40436598554.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8636b23bb6ab54bbe26fdef2a7e0caac/lipepagisuzaxokuwelod.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/39867774918.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109010757259221.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/98415184206.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3mchboeu8f70rg3urjfgdltb7/16952768361.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/35180282835.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4u9s8ppnheare1p4rbefugu9fv/1396744021.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kuxarumanefinizatufebired.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/zozobuledivu.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xiguwezax.pdfIn PDF document text
    • https://marosme.ro/hirek/file/89979214603.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1501790dda659b9edaf987f4de15ba50/bonazumesibunajudux.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad39b87574---63616727903.pdfIn PDF document text
    • 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_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 10876 bytes
SHA-256: 028f589366f7c55d8ffbbf3f01f545fd3dd676e7e6023d2afdc4fdaa3e213599
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 17296 bytes
SHA-256: 135836a08433be7213690432601ee116e12a47f0ed18a8b49d65edc8eda9223c

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