Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ffedd592a8c086…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 08:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1acfc8ae5f6b293e74ab797b45f8df8 SHA-1: 5a5b527d445aeab7af514f39a58896bffd565204 SHA-256: c2ffedd592a8c0863fc7ad108e63bacc6a550fb08acc7eadc42385d65fa4120a
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm. The document contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://probeg2000.ru/files/userfiles/files/96724678594.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf67cefbb---51586456531.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/kefele.pdfIn PDF document text
    • https://fallsplat.se/file/22969632307.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/94e990df7adc7b6710ad0bca3dc679b9/96193533860.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/demafidixeduxakufafavo.pdfIn PDF document text
    • https://jss-moms.si/upload/File/sejeropapobefi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/xozetimotawiwijaw.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/77174685187.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/59648766838.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/36616120711.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947603a23f8---98072838012.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1504e5bc95---90861593293.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tugavawurixefe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/54583571198.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/81493210706.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/39677803228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mycoplasma+hyopneumoniae+pdfPDF 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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 10896 bytes
SHA-256: 13a4aea2af4d0242382ced38b2f0b7d55105a647adef495b845c3642c91c62e1
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 19356 bytes
SHA-256: 02f516505e693e7c4c379f967062090580d18beaad8911f1e0a543d51c11786f
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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