Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17166b91334765c…

MALICIOUS

PDF

95.6 KB Created: 2021-08-31 02:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff4041213da82d9e2e696fd5e2849085 SHA-1: e54306e0c714392b8129013298d4407f1754d0a3 SHA-256: d17166b91334765cc107825290cadbaef603e02315392b8f494d446f0058a736
156 Risk Score

Malware Insights

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

The PDF file contains a link farm structure, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/lrda8432lm8spqcd5mbvrd8isj/25256659728.pdf In PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rufukevozasetifuzapopa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/52053121434a206f3a2cc45e43782c5c/69870997155.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/defasurolo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc35a60b2---retelovapiwesawonevame.pdfIn PDF document text
    • http://digifast.cz/userfiles/rifejawadunutas.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2928de2347aa6ca8a15f10e4ade4ea31/62168337801.pdfIn PDF document text
    • http://whatdwellswithin.com/file/raxewezabefigimopanutuxi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6d6eb1aedd9178f7bfc83e828bb6d1d/17287461457.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7e35ec709ec9d6b3ffebfba8d3a74d91/62973393616.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2870ede6e3ef65ec1f8dfea3f17aaaa1/30629773336.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/27048715940.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/77966818675.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/dotaweden.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/76521857287.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/27579818230.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/16923961648.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xotifaje.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a310332d2b4995e810b23789a147ef88/51387205038.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/46579236804.pdfIn PDF document text
    • https://triosms.com/userfiles/file/8000066931.pdfIn PDF document text
    • https://atlantidegattico.it/file/11248475954.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/viriberejediguwewagokuraf.pdfIn PDF document text
    • https://atlantidegattico.it/file/xajufisejatajinobesaludaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wife+spends+all+my+moneyPDF link annotation
    • 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_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 10568 bytes
SHA-256: 6c1656f643b50e42b46cdf8b28a958181f5de230971ac91bba86f4e88aad894d
font_01_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 18660 bytes
SHA-256: 9a384da83c5ccb28390ba40209c03990729dd9e6ff067835348c707c8ab509c2
font_02_sfnt_off00015818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1