Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b470af7ce7a1d59…

MALICIOUS

PDF

73.0 KB Created: 2021-09-23 10:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1eb32c9fc845b334a99cc331572c6f52 SHA-1: 2af608d84923b0d66bfa18e3868f21a46d7c1b88 SHA-256: 4b470af7ce7a1d5958f6748ec718840f3b33b94e7528568097d02fbfd49350c7
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to trick users into revealing recovery secrets or private keys. The embedded JavaScript likely facilitates this phishing attempt, possibly by redirecting the user to a malicious site or displaying a fake form.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://bfttacg.marketsearching.com/upload/files/rejusadexutowo.pdf In PDF document text
    • http://leguido.net/files/tuxexotetudoparagaxuteno.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3to0k8ohavf1l9b1513tgmg61d/wotiv.pdfIn PDF document text
    • http://belniig.by/public/file/42747006676.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sg5j9gfsrgicp3iqjnlj3lg3fi/xizamuwefinu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c03553237b---lowirada.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161437b55aaf56---38374147513.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcae9a215d---60665002197.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hl3khsun6gpjg21558884m3ffc/likozimixawosaxez.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/41c84e69276061ed321ad42ce281fea7/kirefuluvuzojo.pdfIn PDF document text
    • http://santeh.md/img/files/31678037562.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/9681331671.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/xitibew.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sagina.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wunegafazilome.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/kinonemeza.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/29180343662.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143291e6550c---pasefu.pdfIn PDF document text
    • https://manenshop.com/upload/files/sojexuto.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/gobixodizudurorofube.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///vezepopu.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/zunevasirolam.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/38430452744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gallery+load+karna+haiPDF 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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 17452 bytes
SHA-256: 31b71cce4fccd6ec55499b2b659927d03d695185773c8a108eb989aad8f3c833
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10324 bytes
SHA-256: 4f0987f470d1c76e9cdf795322a543bf10b0329934ca3868ad928ff65b674f68

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