Malicious PDF — malware analysis report

Static analysis result for SHA-256 0634662b3c85bfc5…

MALICIOUS

PDF

103.5 KB Created: 2021-07-01 22:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16d3561458c01dca491e58db04c369b1 SHA-1: 8c879c17fcd8d37f62aa6b285f90efc3e8395c7f SHA-256: 0634662b3c85bfc559f1013eae2e2abdcff436b756d50f1d98927dcbeb9f1162
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. It also features numerous external URIs, with several heuristics pointing to it being a link farm hosted on potentially compromised or disposable domains. The ML classifier strongly suggests malicious intent, likely to redirect users to malicious sites or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://hizlipin.com/calisma2/files/uploads/16180632332.pdf In PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/gemokojovujerogusolor.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/sijixebededo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd9238f32---53293942962.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91d7a271f---tarinadefazejupuki.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nipemosasibibuk.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/856d9008afa746e7159c6b26ef73b89d/95814165636.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839582ad45---tiruruz.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/nurenusomuwi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac45dcec1---8957951973.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4561b9ca4---55990206110.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608af951db888---88620226242.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607759705b80a---18364852915.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe01107dbc---fijazorelibegeboxovum.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/gupatilarorowidokaze.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/50021211075.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0df2d40f---76307186073.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f7f4920411a27353045378df211c9eb3/lafolujadepapitekeserujin.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5abcu1h4mal6tj5qundhbuem3v/95277844365.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/25428886780.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ced0eb649057678c3a3b116dfb37b4ea/lotanabunivaperavivemog.pdfIn PDF document text
    • http://armanetti.com/images/kutev.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/64480357006.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vizotesiletevivejuvuv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8bf9fee9---bamikorexu.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/35052330507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=project+life+cycle+questions+and+answersPDF 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_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 11048 bytes
SHA-256: bbbaf25e19785c942b505d936b0c1f1753a3e2f09bf2bd830b71569640942a12
font_01_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E62 18268 bytes
SHA-256: ab0c51e085139136f3c97c44f3e122c9d42016284020b2c480a817c5cbc2764f

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