Malicious PDF — malware analysis report

Static analysis result for SHA-256 0890e1f3ccb9ffec…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a60e5bd3a6c98eae8c11d6beb3579f6f SHA-1: 8e8a61d940c9f3740bd6bc3e7fa93d906e3d89f4 SHA-256: 0890e1f3ccb9ffec1ffc98220615fcdd6dc1b4d9b0ca6530d90ad530e7d0ee8d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files, suggesting it is part of a phishing or credential harvesting campaign. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery information, such as private keys or backup codes. The embedded JavaScript likely facilitates the redirection or collection of this information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5baf0854fc---82266346970.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c61dad39bdf---12445456216.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d29ebd7d245---70400046872.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/16838333567.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/sefosisebixososireretitom.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff176555e---lawajotevitu.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/migalepegetokujerojujazan.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec91a43e3---68693577515.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/suwune.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/xejasopalovosoxab.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e23be229c---6148788387.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabce95c211---gamalorukezezexusikan.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/53504793279.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/i25holfm9l48dsf1ugopl9p4bk/58533197920.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885bad96167---fofuwijozumidogapodu.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/24342854072.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8de0bb8tiolvsonjl8smdb2m1f/mugojunirazupapo.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/97229460904.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/54483369202.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eigcchrnte1ff584uu940562md/buwazukonipivupidele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+edit+a+digitally+signed+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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 10764 bytes
SHA-256: 07a7427fb4b98ed073fcdd396d443e82cdf6bd4737fca7da2f6bac6122af938e
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 18112 bytes
SHA-256: 0d0f68d3faf5db2ad2487385130f7b6db9fc4aed36145c16e9bcd4c5808956d5
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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