Malicious PDF — malware analysis report

Static analysis result for SHA-256 783de55f8c9255d5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 14:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a045c60d3c829d26199a5c27e0934b60 SHA-1: ea675bc5c97583d7bb4d4a2c580315298be6e703 SHA-256: 783de55f8c9255d594f16293f57c3b59ef643fe8794a7cb4dbff61c34056814f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on potentially compromised or disposable domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=xiaomi+mi+10+tricks PDF link annotation
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jaxonegogavajogef.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/70617630759.pdfIn PDF document text
    • http://355353.ru/userfiles/file/wubimeripeb.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/bejoxedurovafomajebisa.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/55187294759.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/76625400739.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/puvifoforewaxuvibole.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/teviwaginesupumavug.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/13003569823.pdfIn PDF document text
    • http://xsjprinter.com/d/files/sejekipujiwidukolojeketa.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/zotazudilidozoz.pdfIn PDF document text
    • http://scarpatti.com/files/84643529101.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/23040619265.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/wosirujatebofekura.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614005c826155---rikabepeguburomekiwotegi.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nabikulupag.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/29761735732.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16319029446386.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rm2vj0sbga48qhidamdmu2i9vp/tufuwolalazupumovipide.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/92710206771.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/zugapibovazelebo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613783f8bcb92---tigaxas.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/durugeropawapasedukenek.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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 18504 bytes
SHA-256: c4c0736d667175e0a9f4a2f941c3eee5636639793c99d11abf3e83ae947cf4d1

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