Malicious PDF — malware analysis report

Static analysis result for SHA-256 844f7c22482f65ee…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 01:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fba39c4d573492028e0ce5d6370d1e3 SHA-1: 3477e26f2a4e4ec245e7e2bf8bc266129f614e6e SHA-256: 844f7c22482f65ee22d7c1033f3ebc41446d6f5d59e2c3833ff7b3a036de8c82
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae07b4e94c---30806083307.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/67113054679.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/43217692798.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c729403c3102a73f29b185951d9246d3/57437365457.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7dru8p55sbdimsrf95vd1avd9q/24720587105.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc83f8ac2a---dijuruzogebula.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/36745801602.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/52062068797.pdfIn PDF document text
    • https://anandalaya.in/resources/file/xenelevufafizavoki.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/baderazavitu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/36992546548.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/ratiduvulofuwo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/85555814973.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/30846055389.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/75404789154.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/ropanojoxakes.pdfIn PDF document text
    • https://tuinvandecruys.be/file/zakofubupuxatedonobekiwuw.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jokaborimozadako.pdfIn PDF document text
    • https://baptistfriends.org/media/24273777023.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff253094f---76028254865.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nawisafexebijani.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/solalododewuk.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/37779737395.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what%27s+my+mobile+hotspot+password+androidPDF 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 11024 bytes
SHA-256: 908a45ddc02e331b93ab8ee22c974feeacfaa1dd5e942b81bc22d9357a7da6a5
font_02_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 16364 bytes
SHA-256: 687be21200781bc068736319075dcf10daeb024783b2c836a70ec1281380d6b6

Open this report in the interactive analyzer, or submit your own file for analysis.