Malicious PDF — malware analysis report

Static analysis result for SHA-256 041c1731a3cb8701…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 13:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b835034fe92e2b652c610e24e083ce9a SHA-1: afe28ad3e2f3e2c75b4279195663d54375a9f45e SHA-256: 041c1731a3cb87011d4dcefc2dceeece68f3566a9ec2922514a2a101c545c428
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is used to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4606

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=yasuo+moving+wallpaper PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428e83b6556---debat.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/semozuwira.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/zazetimudogewetidop.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/lokareroluxezutu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/68660158928.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913003715190144.pdfIn PDF document text
    • http://adriennemason.com/assets/files/95879641019.pdfIn PDF document text
    • http://preiss.at/upload_files/files/4060870442.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/pewod.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7078f27ad404ea4eaf29ff4d3777c8d7/xobupimakizakojaxejo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/11651564609.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/muginep.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/8991977814.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25c7bb2fe---19150639952.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mawajidepewa.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_2E8B3E5CC27DADC4.pdfIn PDF document text
    • http://szpk.hu/_user/file/fajexurukadafede.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/11231103633.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/40554312011.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/saxorufo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mebizetuwivamurireja.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/42884371437.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kidepukefafuxamilit.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vizebepipeduv.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10732 bytes
SHA-256: a31227eea0223cea34d15cd8261702da4dacb95608289b141d5a9887b49b2642
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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