Malicious PDF — malware analysis report

Static analysis result for SHA-256 59123e3a613ca5aa…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 14:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 288df25138be1e4b73de523ecc950bd5 SHA-1: 9617d4fa0610ead96f94b8a44c226c54d76f3e38 SHA-256: 59123e3a613ca5aa1c7a0226c547d0e7377fc78d851c5293a441f0db2a4a7580
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://di-tech.kr/fckeditor/userfiles/file/fulodok.pdf In PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/suputujexujeludi.pdfIn PDF document text
    • https://ysh.my/userfiles/file/12546991877.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71e937a73---71498374071.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fokuwixatewitafu.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/99319133084.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/50538188877.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nemidibexumotijeka.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/feguzukene.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/zukaxow.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7874ea17---56977584358.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0c0c1702e---ganepisow.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092412004441.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/49272113315.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/74183343567.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/46595856755.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/85799436005.pdfIn PDF document text
    • https://phuquiland.com/upload/files/zezeragumuwi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cea801254e7a04638ce34ce440f9ae60/66255063.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091603355420.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/funikowew.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/939b97d65119367ca57aa758ec87e38f/reweranifobeta.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8abf0af3---libep.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/43236825428.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/28889439525.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/10714857590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tps+in+misPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 17020 bytes
SHA-256: cee227f83a6ac2a28765ec0836f06d3a4cd629f7324c44e23e9f44b0bfc89797
font_01_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 9720 bytes
SHA-256: 960d8a70f8b2e126c50115738255f748b8c75b7e09e55d860338d0d23d7eae5b

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