Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c7cfd8ad1df96b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 23:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceb517595eb26af13f4e4587b0f79ee0 SHA-1: 04410323ebe444341fd84fdefcc77bf0657e28cb SHA-256: 38c7cfd8ad1df96b8d1e31074c414907bfceb3968d77aa256f2c7cfe12843e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=botim+mod+apk PDF link annotation
    • http://bhk-aindling.de/userfiles/files/fijofedogaz.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/84320560306.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/kilimuredixoduvilug.pdfIn PDF document text
    • http://mopron.ru/upload/files/83763212899.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a9893e6e---62263944302.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/8111625539.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/78824737490.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/kuwajosawabuga.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc398dcc2---34713435698.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/93534276184.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/55466403738.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/40702113363.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2caf598745cddc80c3daf6ae9923517a/19412539460.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/rifitav.pdfIn PDF document text
    • https://buka.ru/sadm_files/46666027958.pdfIn PDF document text
    • https://kawanmto.com/contents/files/kugisapawo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4fe0df1---42246697729.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353afbbcb71---71760198661.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/xisomixu.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/sovefexakuginu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/bovefugazedezovaxeza.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b1f345cc---45594977887.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/50597139826.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ranatulosofinib.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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 18608 bytes
SHA-256: 74686978289ebfe654f0e9d25f647c0212d5f85a6254a43df0df3b17bf9223d2
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10148 bytes
SHA-256: 7052966d708fcd0ac9f145e009bf42e9f1dfbdf244e3202005fb8cdb9734bf93
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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