Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd701e8702dcfd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 15:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e2f92b468e3d899caa0b6a24f9e586f SHA-1: 6c1f5f54767790601da7f705eeaad353613fffe1 SHA-256: 52dd701e8702dcfd73b7478937cfbf38c8bf87eeb5b6a8e670efba4ed66ed9a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=chemical+composition+of+cement+pdf PDF link annotation
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7tfj0gnvn3ssd0dmpqpft0q185/663351549.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nigujetupele.pdfIn PDF document text
    • https://mollis.rs//files/kawegirilelizitemimepuz.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/12ml6kt9a1hp007989m2em70ni/90442125601.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/jixokesimebozenanolamez.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210531193313.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/naxoj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef9958350---60109086714.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/nemebowipupatikerotus.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2e78ab7d6c7237632d23c880ecfda9cc/63166296901.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/janosorotexadomemubuda.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/87363695350.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/16765697946.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jfkuu896n0k39jv717hkkr8h71/zutuku.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/78752266955.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/177f117282da5c3c2494032d2143b752/90240818383.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa9b1n52bqi4eco6rrd6vqeqhl/43473277583.pdfIn PDF document text
    • http://bjallstar.com/upload/file/17380910949.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf143b8c1fd---31508510829.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/26765909345.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63540667549.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/5803175023.pdfIn PDF document text
    • https://aashianarealty.com/file/domaderipebat.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_off0000c18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18E 10816 bytes
SHA-256: 2a4b2f23d4040fb18e23134202b23ca0c36529cce317c30de3ddd7c927a79b95
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 16872 bytes
SHA-256: 7b0456db37c703bdd0fac410e4ae81be2f4007df79b2ff786562211dfa521089
font_02_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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