Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d4d583ed6f2dad…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 16:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dff4feecd8b94c6af8e5a7f32c3917d SHA-1: e1ace65b2a0642b02a277b74d7092bda1b317b25 SHA-256: 99d4d583ed6f2dad54a54706132a3af60464958f6ee89058c85cc2b8c55e2f3d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification of this file as malicious, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6603

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://tlproduct.com/userfiles/file/6201601068.pdf In PDF document text
    • http://gradn.ru/uploades/fckeditorfile/23465597892.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/podulunixaxelavijedabuwaw.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/xawuwuneberofegirizaxazod.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/85144615878.pdfIn PDF document text
    • http://telecycling.org/files/file/kulexi.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/tagotuxonafulop.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414fde59220---vudoputusavowudeguwag.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910153343.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/22450877721.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/42b3a1884f8044fc004c17b3108766a0/fonidibilakidelepe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140826be157e---19823938300.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/vizuweporoninisoruva.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kesezulomolawur.pdfIn PDF document text
    • https://pixel.bg/img/file/legiluvever.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/wikedagagosoripamevi.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/zemufexinajoxidexuribufom.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/87923069671.pdfIn PDF document text
    • http://kvrhousing.com/uploads/vixuxusetefinijirixeketo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/mowupagatamabojojekefizu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/5215493474.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/71848662591.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5bd0af14---zokire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=incomplete+combustion+of+octane+equationPDF 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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 18256 bytes
SHA-256: d04984b08729d9d6794dff5cb756125c506a6a956031067a056b5c4075abb237
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10880 bytes
SHA-256: 9f40d56b04075020a49df07d517a5e8e0844787cdeee0ce66d66e0ce5be96c2c