Malicious PDF — malware analysis report

Static analysis result for SHA-256 2308b46dc944e6b9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 22:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3f753fa36b4781df1b646f67d49f893 SHA-1: 50481625db0a2c16e960b7ce6d8d99a128ec63cb SHA-256: 2308b46dc944e6b95c47e763cdbc93616445521360da799273c83152d03269b7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. Several heuristics indicate the PDF is designed to host a collection of links, likely to lure users to phishing pages or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://garglob.ru/uplcv?utm_term=yoyo+apk+mod
    • https://mavachhaiphong.com/upload/files/raxaxawedapemabif.pdf
    • http://brandorbit.in/userfiles/file/82377954616.pdf
    • http://fcraregistration.com/UploadedData/file/jipavijaful.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vebawefipunijomasafarewof.pdf
    • http://bluebossa.pl/files/file/ledifu.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/rodebuzusos.pdf
    • http://ambvetfanini.eu/userfiles/files/tarebajotewud.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/32806688136.pdf
    • http://ritadas.in/userfiles/file/jekelopowu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef23f21f0---79073998273.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e359d812---9617435590.pdf
    • http://actinq.nl/upload/file/tipexefitujowu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/de64ad9c9f695d45b343002e44dc3d70/3723067105.pdf
    • http://pcccphucvinh.com/upload/files/46316570974.pdf
    • http://wangyiphk.com/userfiles/lexat.pdf
    • http://cpgny.com/userfiles/files/27594336023.pdf
    • http://reliancefla.com/admin/images/file/gilobasitupalupimexoxuwi.pdf
    • http://fusiongrup.ro/userfiles/file/bozipubosedavukoveda.pdf
    • http://thermcom.cz/userfiles/file/gimonutagonizomejirolato.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145665646f6a---bawiwomifexipenawofatobe.pdf
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/jobaxugudaw.pdf
    • http://megalabsrl.it/userfiles/files/ziwevifovije.pdf
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/93484925011.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daff.bin
62219796468e2c1f265aa01ddc8c276fede62cf79e50a502cdc03e7f6fb9517d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 19228 bytes
font_01_sfnt_off00010d85.bin
12a8b6254f315cfc4578cf003bf32d7a0fc38bf282e00bef10c101bce672954e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 10004 bytes

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