Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba4dfbd641ef175…

MALICIOUS

PDF

74.7 KB Created: 2021-06-24 18:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dd8bcf94a621bea751c6a3c278f07815 SHA-1: 19ad89bbbb8b9fbd93a8a63ef0ffa8c192e0c742 SHA-256: 8ba4dfbd641ef17536518fdedcd02e69a2994ddaf3413e5388c5dbc8b7890ccf
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs indicates an attempt to lead the user to external, potentially harmful, resources. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to exploit user trust through deceptive links.

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f221dab803---3682709.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3489e927---bafelofenim.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084440ce2b6e---87206982869.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/pipetiwid.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1de1c0a5---82787215998.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/1385142189.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985902d58cf.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/99649883976.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/14641257896.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f2d0ad9604ffd849a297c6cd18ac761d/bofulisedimegiwaremu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gorun.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/duzuzajemikunefakor.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087272a27490---bomamixisebabe.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/10336011609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hayward+swim+pro+abg100+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 5768 bytes
SHA-256: 02fed4a0819871adfe4f774b2aeedad5cfc04e71c821c30e377a2a342e297463
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 11552 bytes
SHA-256: 8e9ed6b3d095d72e0f37b875bb0a052cfc3978f143639617522fa24502f9869e

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