Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec5dd807e1ad869…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 20:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 01ee5c80f3699c37279496c9e16a416c SHA-1: b4ff6344cdbe2e351b5670787081ed8c0775d048 SHA-256: bec5dd807e1ad869560d1fbca90dae298e68315a38e1fb0dc9ab86afeb4af3a0
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=windows+7+product+key+generator+crack PDF link annotation
    • https://rugsinc.in/UserFiles/files/66895715178.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/xativaximemifidozovusik.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a268fed7414---xovekefime.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/jonimipimozerezabifu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g5f0cdauhnpp37qhr2v1gh0cm9/65633864898.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/wovutalakerobin.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6aef0617---47079140296.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c15c74b078a95fe7b50f464905270325/9919235264.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/1991545644.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853c5a5dbc---bevopura.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/889729c42806ede0af6c3d0485ddd09e/pudovofivab.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/poboboduraxamuzozopesoto.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k2486adn31sjatbsv5i3i6p6d9/rizon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 5560 bytes
SHA-256: c4de270a48480c3956788e4a1fba6a4ecac44d084c0acb9cf0a34d4047b331cb
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10696 bytes
SHA-256: 115c361a7b28bbcebd75eee8ff5f3079f5b06ee65ec77458dcfbc52ad0fb4867

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