Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0e0de8fe5d8ef6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 18:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8aff76cee98e2b07de15329985e1add SHA-1: ea25e189d5fa08c30de4910311fcaf684be0afd5 SHA-256: 8a0e0de8fe5d8ef6a64e74d28304046df4fb8a3b5341b5a834d6985b472b4d5b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://oniceh.ru/uplcv?utm_term=solenoid+valves+symbols+pdf PDF link annotation
    • http://tangiahoang.com/skinkorea/Images_upload/files/78117371141.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/23272109175.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a45645777520867f2f6a7322dcf7864f/90848130404.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05224bbbca---45459397044.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/70201751699.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wexojegagukazob.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c222c107---33581648743.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/70270779229.pdfIn PDF document text
    • http://elitvorota.ru/f/file/56162410447.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/geviwenowitukikij.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/79139284542.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/27830820475.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/39517965539.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/kibatu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e44705f1---31498900580.pdfIn PDF document text
    • http://sam-global.info/files/file/9262350061.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/kibepasa.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086e887771ec---81961603203.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8f2952149---forirutokofuzebirev.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cb1df2373---lezezoloribikokixido.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/pisiretotu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8333a2c4---1256117501.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/75462094559.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a0f02d17e---51013171572.pdfIn 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://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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10856 bytes
SHA-256: dc61a4f37195f75be9e406285658f5e9e7043f7bbed4274940b2cd9bc764ef19
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16720 bytes
SHA-256: a7510a3d10f035201d245605724046d74b7a8c498c1d1fd82372b5c757ed9533

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