Malicious PDF — malware analysis report

Static analysis result for SHA-256 26401260e3479926…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 06:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2875712f33df742e4472683b2e42e6f6 SHA-1: 504b1b78f9718c431867460a5bebb5acdb6a6d2e SHA-256: 26401260e347992642e2bf55fb77e7927821669b0e3b610a56713f8d5951c427
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=goldie+hawn+and+chevy+chase+foul+play PDF link annotation
    • http://vce34.ru/attachments/file/wazezoxabamufukotutux.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929a2a6da10---lefinikeranuwopij.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b78b7445---93483001440.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hut7cu1b69nsrvuq3tjq3q97ck/tegubase.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pepopelofetomegak.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082faf12cecf---15316840304.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/wisixinogugo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/510b3c33f88eeef70a7864ae0dfea014/97426160776.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8b3f801---nugiv.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5dbd735f73db564b8c299d2493a55d8a/31657257305.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4357b611cb1debd7ec8568c92a9ef699/nogukigu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sekaemcli1ducq37ulp5ragg4d/xatanunipameladetusag.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/88205290691.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/42526455256.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/54925302888.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767086c7797---36886404217.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9a044389---28932568760.pdfIn PDF document text
    • http://citra.cl/userfiles/file/revobezaj.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sigifopaziwuwabomuzebek.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/raxuwalupad.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/gibexegonuk.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5hjqdt5a0r4lgjq2fuag6qc1gf/18613523394.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wojogamijemesug.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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10924 bytes
SHA-256: 32e4f6b40ad54058c4cae2a532f609a3bef5f235464a46e9eacd8c860eaab8ec
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16876 bytes
SHA-256: 495790dcac695c31f4c399460300e08d9724c4284413444d94d265a19ffb44e7

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