Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b773281daad00b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-08 17:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fce3d5de3ab5671e534abc7f95485137 SHA-1: 99f6c9bea84bea19f60f469ece9db1dc5dc55b5f SHA-256: 53b773281daad00b28ea3bf814ad75845dd4c74b8c1cb72d6374a0bb3a5f8ccc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress sites and other disposable hosting, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7641

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809a09fa5a---gefexedasonafimujekorudoj.pdf In PDF document text
    • http://devison-matras.com/upload/file/sizira.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210903041228860.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/eceab57e77007ed35758ae962a222b59/fudikiwoxafukijejomag.pdfIn PDF document text
    • http://halaljones.com/uploads/files/36363538693.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_61315_357.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/238024939.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/48222612152.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/ferozevatuxogajulikigoz.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109031256228237478pejkg.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/rekerisuminid.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xatidigotudi.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/70663345923.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/94817217600.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibowegeraser.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/26913262372.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tog3dks2tqdjv0ai9suq2t8rj4/damelorutajudos.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/17974735842.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/92532915560.pdfIn PDF document text
    • http://vuason.vn/upload/files/81991565287.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dijepuxe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=civilisation+francaise+fle+pdfPDF link annotation

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