Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c5edfc4cc3bbf2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 09:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc58a01f3847582c8ec54f0b662ef581 SHA-1: e217e549768554c826bacd73b4ba6285db27e873 SHA-256: 08c5edfc4cc3bbf2567f4f388c739f076e9662ed50d2b411a1906662f382a841
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate that this file is designed to act as a link farm. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa831e03c7---14307585541.pdf In PDF document text
    • http://vers-ma.de/userfiles/file/81012299797.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/21540725307.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29214074383.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/61195968932.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/40190992732.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xegiwopegufuvutoxodefi.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/vubonureposasitisagarevo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/28519562403.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gimupizobutabop.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/47979840557.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130769a29e86---31935573673.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/jewegar.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/zonoxijivofogefoxij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6330573cdfbb78d07142ad3bebe170f5/92481942933.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/54950561808.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/43014486330.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306a1b91a2a---jitaguxowoza.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/98217434332.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/3502452125.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905010524941.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902082706.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/rexuzokeketum.pdfIn PDF document text
    • http://8njl.com/userfiles/files/wogodapasibumidizumixa.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/nifiwotunuvoliwana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=master+english+subtitlesPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16452 bytes
SHA-256: 4fbbce77645501d82c724c957b2cceaedee4d93a07dac0aaca5cf0e0b177930d
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10500 bytes
SHA-256: b0f5f7caa9f028e6735431f8bf7f04ac92c6647fad8a7b113b5be2cc80189838
font_02_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1