Malicious PDF — malware analysis report

Static analysis result for SHA-256 392e00b4cea56536…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 04:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 260d528657670ed4801f71b9798107e8 SHA-1: f5c7f72ea8b0c48c3499e4fdd25867d81580fa88 SHA-256: 392e00b4cea5653660e66fdb6876ae95634df2c4c454f03facb9ab923fb18163
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fitviewer.biz/files/file/vaxixigosoz.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9a628327---sunorozat.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/51020173873.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/remakekasotim.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210715_173855.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58198cc0e7918d5362e32b92edb0d79e/kevojuluwununaxurezaso.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/al9hf441nvr850jhce79ih0dct/28981208757.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/59690609053.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/11264667464.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5031b6a8aa1108cd06fd10eb652e8212/xuluj.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/20031145190.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/90281122572.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sj4ir9qlcor2tcp7oim1fgg0cn/wevikiponalaxagopojibog.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/8504550249.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/76031300753.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/dafeledeluzefododod.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077956303721---jekulunakunevomunadu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e16d6b4609c---rawepejamalajososera.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91bef33d8---lazufetuxo.pdfIn PDF document text
    • http://livestocktool.com/d/files/wizurosesijevu.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/62977564272.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bf1db960---vidoxowifikexetunarim.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/37691094959.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/5583936696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anna+magdalena+bach+minuet+in+g+pdfPDF 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_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 17844 bytes
SHA-256: 4cc5f3bf3bdcf3014ad70fbb565ee3b6658b50246eca9ef66c1355873fa350a8
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10900 bytes
SHA-256: 316e9a81d45a5e860ac86c6f1556ef0931e71bfe4dab2796ee9c67e6d8be42d1

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