Malicious PDF — malware analysis report

Static analysis result for SHA-256 5675fd5839d93800…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 10:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a05393977fba8f374a18f5860d9fd233 SHA-1: f038c45d939d67c4b19d11a22fba4667d3f95de1 SHA-256: 5675fd5839d93800f03b043d06a1cce72494f6e0cdbd7a5ee5549d13a1e52605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links further supports the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=tylosis+with+esophageal+cancer PDF link annotation
    • https://eatorhours.org/e-bussiness/fckimages/file/63212524823.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/48166143913.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/bulet.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vemunutizaz.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/42237033780.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6491714cdbe67c3d67ba4300dfb12699/sorixunema.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/puzotuxi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608582054402f---lifumozulotoxujusogemax.pdfIn PDF document text
    • http://asfalon.com/__files/file/mekokokop.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bf9c900d1c04e2d64ba23e8e136b66e/92110142480.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/fowipetufujume.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///90067980766.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/372480227.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/iho363ncgqbsoubmpf090rv67r/rosapabuxa.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/36794020996.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/sikom.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/42738045305.pdfIn PDF document text
    • http://emeat.ru/var/files/9359000063.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/87f58baiqhf54p2fdlle8hgh8u/pabilinedafodatisabesomiz.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/natume.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/zazanedimunemabiga.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f08867fa---98008617475.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q7lmirarlbufvvofur0gh00o94/20974285061.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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 17204 bytes
SHA-256: 59304f7260ac545496a3d532f753e5df665d1dec344e5028fde61d889d755849
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10816 bytes
SHA-256: f2b81343b5f26a53c11797d7a6aa05f46d37c7d7a1080cf57c65dc47c63b8114

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