Malicious PDF — malware analysis report

Static analysis result for SHA-256 9082c3b7677fc4b1…

MALICIOUS

PDF

146.8 KB Created: 2021-09-07 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df7a77a7c7a5878a82f5cd9cfe4a69db SHA-1: 582d4aaf5ac43f2ce95a35b3640010932c8563b7 SHA-256: 9082c3b7677fc4b108002fcb0f36868e447c81815269023383a1f525ee632fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/wupafiku.pdf In PDF document text
    • https://partner-support.net/user_data/userfiles/files/xivimoxufewidi.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/5688927822.pdfIn PDF document text
    • http://fygl.net/uploads/file/121412506425.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108270718482354.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4805a8e4b5bf1685a5b7aceaf1413c52/fazeluvak.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/6276112778.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zanutojutuxado.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/wopurom.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/magosiluxalop.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pseq2sgs2j6oilsjmu4ibqlha2/25928107905.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p8s95n29a1kqkdcblprk69od6s/vikozusazewa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f1d64058---42583524441.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/guwip.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/24803093143.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751d0b4817a---lusizebijorigukorobal.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/512e1a57c4ddbdddbdb8bea69a59c768/71411018902.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/40fe7d0d89e7677bd91ec5cb2c280f16/43692576728.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/munomakudinefaxatug.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1f387abf5c94a7f8669e8e53a9de6de1/fenojuxixizaxugotuxabovu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/solobigizux.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/14f6489b5be9b292c3ddf0bd8122f82f/72093697595.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/82760459777.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/rarezabepato.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/86758983876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dirty+laundry+klance+fic+pdfPDF 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_off0001d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5DC 20920 bytes
SHA-256: 2b4eacabf7be0c19764b69699b05773e0d48d72820e2fd56d0be25f179feb3a3
font_01_sfnt_off00020c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C7B 10632 bytes
SHA-256: 66cc8d29b16439da9be6bfc5153b622fcd95c7ebcd7ab69f5ade3546f43b4ec5
font_02_sfnt_off000224f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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