Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7818f90409322f8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 13:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 024279c5c89588b861ac24501b97e867 SHA-1: 8a48911d8900d96e492bde93b72076dd81e59c32 SHA-256: b7818f90409322f89c375aee991fafdbbb3f8138c08fa38bb6e1dcd66d2122ec
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking on them, potentially leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0c361578f07c9ea4504fa52c5013a11f/vuderatu.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/milubomegogesinarero.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/zibosan.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/duletibazilozixatimiw.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-12/20210812051454829475.pdfIn PDF document text
    • https://togeltop.net/contents//files/dozoraposuj.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/61973618579.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/katuwalakemenubo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wojilexolekuwevigagijode.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/85463349803.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/64820029908.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/p4npnkhrbkmrt272n9oibohchf/zokiwonujagaxurujoluv.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d16b632fd---24284575055.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7f1bbfc973bfe5fb44e6aa2e6841ca4c/kupusuwepuwoda.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/dabekuwavapubudu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cca4942c3---46340049451.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16076d762ab141---64688135345.pdfIn PDF document text
    • http://samtekelektrik.com/files/nobugunularuj.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ff89fee36d3d392287ef635a661e082e/vavuzisukagepibunedagas.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290201213197.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/15240203295.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/bepisop.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/34126508238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zildjian+gen16+dcp+manualPDF 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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 10784 bytes
SHA-256: 5c648dba11c2cb200bfcc6489ed9f0c212bc7b7bf58b647feb800be6c426e530
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 18040 bytes
SHA-256: 8f5f07905bd3629fa1b3b893a92f7e76ee8484a1df2090481e2f9de43f5f3ce0
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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