Malicious PDF — malware analysis report

Static analysis result for SHA-256 f963b035f6a9a89b…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 21:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d61e8c6923371ef561c1c68ef57fee43 SHA-1: 9ac4228a0900f490a79096982f057121fd49fd8d SHA-256: f963b035f6a9a89b801df15df2365c5743a4d6d422ed66cda770eb3bbaaa0272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and is identified as a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://catamma.ru/uplcv?utm_term=ntpc+gk+question+in+english PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368eac3461---19923370745.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3129a823---52489753632.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/dulamomidototewasibif.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc78cfe0e---fanugokikolotenalufijiro.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fa0d00bdf70caff0141e9316c7e16b5/78807877285.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46090579107.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/498978ec729eef8e733a09927f08cdde/jefifetotidim.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/pibidururitujokom.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce750e9a26---rasuziredukedogolono.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83b89d72---22890494441.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a842442ad---79283004946.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/wukeziremopokakebiv.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/26049575043.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091965c629f6---98289868636.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/18683851175.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e4c3a5f6---rudosesavaxonone.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/10019775380.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96a70f255b64201d3cd28e97843dd2da/xusosikizazelipula.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/maferej.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d869366596---70362924715.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lopofowoxilukogapezomu.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/66631048884.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609773df8b873---vuguwosadafopatineva.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vpp7mi245qve1i6jeqdf9d965l/kesapax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 15732 bytes
SHA-256: 10325d71f2009be5f56e94570937a18caa31e353870d46efd870210c7d91e968
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10704 bytes
SHA-256: f0128a5e08c76e8e6add92c09610f52157f81d312c07647e0422242220f817b2
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 18068 bytes
SHA-256: 217d0d5b253cdb9dc1716f198569931451e581fbb265152c05af1d3da276ef5e

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