Malicious PDF — malware analysis report

Static analysis result for SHA-256 8926f8b339e6c1c2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 12:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 809a0b1f27c3dbcac3a2d001d545fd90 SHA-1: d0a23798535af72e29eb42b81c9f25297892ed81 SHA-256: 8926f8b339e6c1c21f1c3a330779d8c5674839e1ff3fe002db9f5a1fbf413bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, forming a link farm likely designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://philabc.ru/uplcv?utm_term=light+reflection+and+refraction+worksheet PDF link annotation
    • http://slbreakingnews.com/ckfinder/userfiles/files/dinebosamimerarugeve.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/35025319103.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7a80172d9b7014ec016ec9c22abfec9a/151344869.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/ritaz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c325876465e---13976139799.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd28536ca---53493848421.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lemewawe.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/nanogolovojanoduxub.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16100f9ef7c02e---33569584221.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/gixujubujemewomovivipe.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/josifixawekak.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lapagu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/nuxizivewoxurasaletusam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b249d8e06---7560741138.pdfIn PDF document text
    • http://elma1.ru/!upload/files/95077990394.pdfIn PDF document text
    • http://arablift.net/userfiles/file/59312094163.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/64840339643.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/40910984049.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a10162bc741---39135132903.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c73e10616ce212f0d567331a1a30db6/remobanarokesuvixup.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/lefafirobesukinor.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/xinaxizomuzevojetobenep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7787d6adf5---88977590004.pdfIn PDF document text
    • 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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 10888 bytes
SHA-256: efcdecdfb595b44442aa33f6d6ff410ec5f0a2982588fdf211f7e81b02c64d7c
font_02_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16912 bytes
SHA-256: c9f9079d29d3e89adc97f7deac3bff27ae82ac092aeb5702f88d09e2f9238d99

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