Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d385872c81d302…

MALICIOUS

PDF

162.5 KB Created: 2021-09-08 08:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52e9c8bfb48eaa3c82e98ba16a4eb773 SHA-1: 526f7f193d3736ee6384fafe14e882f0d9b66c54 SHA-256: d9d385872c81d30230c590cbc83d53674a1dc4b533d611b5fe220b71b87c4907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or link-farming scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://synerhu.ru/uplcv?utm_term=original+bhagavad+gita+pdf+in+kannada PDF link annotation
    • https://annjulieskarpmo.com/userfiles/file/xiroxepokebowuwirilezusi.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/nugowewilamozamafuk.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/91481373504.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/34320694358.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56972364587.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zaxefusagokidefi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bff833dcd43---dasujowenosak.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/88288761142.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/66725291682.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c0d7a450b012393f55cea77fb6f96da9/xinuterufolekozomebut.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/nefopelegetajizur.pdfIn PDF document text
    • https://oferta.lt/i/File/67617657033.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c0091a928cf1373186ac7cd4a883abbf/32324433023.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078468585541---51543725398.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/jadirisidol.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/51566056894.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7c9dbbb9---kixugexodam.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/3813297135.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d63393fbe---63524158436.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73f2e4805---nuxenotalovekozubogifub.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/12179045939.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b87de8f8---77852352063.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/70264519762.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754e8336ff---lunatof.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a2058a1f2---92069002998.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_off00020fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FEF 10680 bytes
SHA-256: 1af34e16041615f97ae6c23545fb6de123a0b606a899cab79d77be076ed77b7a
font_01_sfnt_off000227f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227F2 23568 bytes
SHA-256: 1e9b684680d1342e00b38364da6807b273ed85042cae49687e358aaac58e2c92
font_02_sfnt_off000263bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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