Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bb65103f4fb5e8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 09:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23b9b65fb73bd74507e2f5237387475a SHA-1: 921d1eddf80a22c6e1661815b8ee9f89e5625583 SHA-256: b5bb65103f4fb5e87094a84acc3cb196a7076390e3ff3424f620b302f4d09de2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely directing users to malicious content or phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://coretry.ru/uplcv?utm_term=android+5+google+play+services PDF link annotation
    • http://lovesenergy.nl/file/38847466222.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/60aec650a68c6b6b06fe5c5c1fce9d35/71303404047.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/kuzoziloj.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/39050464247.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zifupefapinipat.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/89081832273.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/nufonozimidikaketim.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24831296354.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/54458109055.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kenubutonefedo.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/boxavo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dih6rrs16um98focif6m81kne0/kujagex.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7f227ec7d1a8f5276a9a57dc2989634e/nokakuzijozudetegu.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210910_113407.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2403a3108---4121272522.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lowujisezadili.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/86770845222.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/napiwero.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/mibopu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7bce9f28---gevidoxotozofipaxotalomol.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/konejizutekeganogu.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/pazisijekixiberasupuwegu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/zowivopusimo.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76319699539.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 10888 bytes
SHA-256: c7a22e35cb14a0c1ba1f31adc471d059388d13dc2328f001217ee9c86421edfb
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16388 bytes
SHA-256: d11628e19c710634b6cc207af0ba600da81eabafecce5cae4e354f5a02c3d7ae

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