Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc29164a1debda…

MALICIOUS

PDF

63.6 KB Created: 2021-09-25 20:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd5540e154f801af041870bd42261a3a SHA-1: 456da4365289dd1697dd8cf04ea943ff0fdef1f7 SHA-256: a4bc29164a1debda99d61cd262870632d1357b49f27fb6ce4af3f861663c06d8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and ClamAV signature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4699

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://apartmani-mestrovic-krk.hr/files/10778646327.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d20a543f93---41974423811.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423da570822---getopekiresobugo.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/zafirenusiju.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/fonudizatefadato.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/71269236095.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9fvdot22uqce9j5l5pg4vblus/58705744781.pdfIn PDF document text
    • https://intersat.lv/files/file/30879118955.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/pexunebexoxixinalovula.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/55863803012.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/vebupakevuxonew.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48389758530.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/siwuwivaxin.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85555926095.pdfIn PDF document text
    • http://manenshop.com/upload/files/raxaboxawivutibet.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3031bd45---20273962140.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/1266658915.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/11446520340.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/xofoduk.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109102308069002.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/36217777054.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/45300561499.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/javipoludalofobikegik.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/87677712417.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/39145873206.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/fokomutalijobilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=redmi+6+support+otgPDF link annotation
    • 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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 15012 bytes
SHA-256: 1534ab361ef883ad09481b8ca12c49ec49689c8eb08d08ca33567a0405361a3b
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1