Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ea9bcd34ae2c60…

MALICIOUS

PDF

89.5 KB Created: 2021-08-05 12:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f53fdd6518a3bfac81f515b83c4cf2e8 SHA-1: 94d9d7bb777c7bd06a0bd3f74237c5f9f8449d07 SHA-256: 66ea9bcd34ae2c60582403c07f49dd23ea73406c833c3989014186a4a66192c1
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links to external sites, many hosted on compromised WordPress installations. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to these external sites, potentially for further exploitation or phishing. The presence of embedded URLs and the link farm heuristic point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc70566c6---dubijorobuwatonof.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/razovokezi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/84409595048.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9188441d---72747094077.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a50084f628e3b74a06cd16e81f354121/11466618871.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/70534328204.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff943b948---39744332788.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed10ee9bf---81331695233.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c385935cac9---79273517095.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/93102439008.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210603_7D6E766E62325422.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/wirovutol.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1um4t60et5d0cl67i47qkj6104/75710877019.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337b4e49fe---kojugoraf.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/gowudebimafezuwax.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d4b46e1e---petoloberume.pdfIn PDF document text
    • http://russia-ex.com/fizulirilaxo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21e9659a4---pegemovamusuloremoxurejo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/76796002078.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/161542324.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/bowepagegaxakidaku.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf5b089cab---98077165621.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/jafuzevowewosidotoxuw.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc92d0d6269---92446711748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=huck+finn+quote+jim+is+white+insidePDF 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_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 16460 bytes
SHA-256: c7a556e00ff819d806f596a0b8f3146deef97177d35d9205ad2a97e32d93232c
font_01_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10976 bytes
SHA-256: 64b52cbfd4773b25dd51d115224a529d2b7a0e61dddb0b591cc38d054fc33db0
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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