Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2fd0ad0c3b06cb…

MALICIOUS

PDF

82.5 KB Created: 2021-08-25 00:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 529106d878717bb9fd4c0ce7bd1c40b7 SHA-1: 074dee0598eeca254cc821a7c25f89536005eefa SHA-256: 6a2fd0ad0c3b06cb58ccfed5528948285cb0e9e9eab9e37e8fc7a70fb95f4e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF, flagging it as a phishing or trojan variant. The presence of numerous unknown URLs suggests a broad distribution effort, likely for phishing or to host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fjzy18.com/image/uload/files/22095814382.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ce6f7e2e4251180f56f926bed7426506/23161949514.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1q1h9n3hvigmktagf09fbub1o4/40231309202.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zudavejipirodiforinew.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/merasax.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb5616b679---xunipekubafa.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/62301066094.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/lurojeririrozadasebe.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/9918920568.pdfIn PDF document text
    • https://ethnicacademy.com/userfiles/file/1621956415.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24195917802.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107223ded7cb---fopupemaxusujojazupuzupob.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c70e92cd---54347269281.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/39159734291.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/79a720e2711f54dd4ccf8c2c8f6419db/77904119014.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/navagobo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d3f1a6b3ff7f6d91e9d70e55fdedfb81/benosakokejoja.pdfIn PDF document text
    • http://belv.ru/userfiles/file/gupufamuvaxuxazumupu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f3c0a61ed186de57238a66ab8a6f8ca9/fizikogevet.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zubiraxenifowivudojogiwu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0973ab1ef---nirodotakuvojijifipox.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/14c5f5751e26d4af98420ef5cd5ff4c6/rusuwivurugowuza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vogaparolegux.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nimedinawapejitu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/59379883915.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/07243adfba87ac4ee1a8d8618099c9b0/31764675293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=niagara+of+the+westPDF 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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 17652 bytes
SHA-256: 940040047d3dfc02cd8303daa0f1016d132d324aacafdd930ff48cce6c63748e
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 10408 bytes
SHA-256: 6bcb1869b7c551aac0294dd51a51672dbb0329d4a3424941550b23673b81eb3e
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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