Malicious PDF — malware analysis report

Static analysis result for SHA-256 a009b031a3beb5fe…

MALICIOUS

PDF

85.1 KB Created: 2021-07-26 05:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c90ea18e4e6101d047c82615885a67c1 SHA-1: 02610b47a44b742134fa4654ef23523b07fdf219 SHA-256: a009b031a3beb5fe1bb917343e97346455b9531db730bd560aae2e572f247412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links indicates a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce639caf69---86115372536.pdf In PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/bematafabelofa.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/womerulebi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4hi898htre0qg0imujab8pqoq9/47955584701.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/44602590461.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zakenujetokunu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qk33sbameu4hc4sbso3q9vb68u/kapegibitutijuwa.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/27568988709.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/tolagizepaserumupaz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70087bb238---zevifivekuvumatobis.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98c402fb5---kijowi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/90600012547.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/texizoropuxi.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/lipalusek.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba849619626---49840161767.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/mafegifoponika.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/17169171406.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/eb37d7991003af1a2826fa72eb3d544c/vumilasukuwamowumekovipo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8e6df0c26643f75c598dfbe717da311a/zodasitiguniwitorifono.pdfIn PDF document text
    • http://orlickachata.cz/files/files/faxug.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgog8u34i56o6rb8kcnr9mfei1/65027684079.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3b66192---76599912100.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e41a0f38---56781898518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=british+airways+high+life+magazine+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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 11140 bytes
SHA-256: 6503fc8333123796b26a6a4728e94d0e9128ee9110a2afe75674d2220f7ee003
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 17464 bytes
SHA-256: a71ec2357816c37083f3ad1c891de225be1a445dc835905c8f4df89e5c81567c

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