Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db355e5de8517fe…

MALICIOUS

PDF

143.0 KB Created: 2021-08-16 21:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e07bb63d16a3f92e6ce823972396f573 SHA-1: f57160cf1785aa8aa0fa2a2515b4ed210c93d246 SHA-256: 5db355e5de8517fe414dc6e064d28ab7733468aa72589a7ea76c57b436203162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF, as indicated by ML classification and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The PDF likely exploits a vulnerability or uses embedded JavaScript to trigger these redirects, aiming to lead victims to phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://smidgel.ru/uplcv?utm_term=casos+practicos+para+la+toma+de+decisiones+gerenciales PDF link annotation
    • http://ehs1958.org/clients/73155/File/jatalorasivovanarol.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wisetugora.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/57kaca51k03c7cqnpheh2u7bg0/68918407175.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/08ovq0ju5adlorbm3p6ni345u2/8628228900.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lowonixako.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/22088485480.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160900d5e23a22---77299152901.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/gaxaraburafenilemokomogew.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/50624593012.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/90042432824.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4b727bee8f0f59bc39b0fc87e2435323/35532242528.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/12441893295.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-4/20210804084332784764.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/19495845434.pdfIn PDF document text
    • https://yuss.it/file/6523631367.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a2a8a46e0---xoruxekigasukuvipis.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/476f1025d85d126a20f42c22986bdd54/tudawidiwapugowonajuza.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/33816098442.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f87009fc8---56544965279.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbae49d01b---21590913306.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/77609549960.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/79371511285.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0c9e24d24---11528222603.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_off0001c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E14D 10888 bytes
SHA-256: 0966a1cf70dbadac3839f0bd5078ca1d5a7dc603809a668b98d4d2efde1798a8
font_02_sfnt_off0001fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA3D 19320 bytes
SHA-256: 7b6525e78badb8dc8b7a782aa90bfd1397ed18438f083b85e6a5d948502ac06e

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