Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8648a690ba86eb…

MALICIOUS

PDF

86.6 KB Created: 2021-08-16 17:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7de27f680fb7fd41316f82143ab0372 SHA-1: 0ea735f2647d38e223ce88c1c0e79b41991baa38 SHA-256: 8b8648a690ba86eb69bbe82c186e3de710f4a43ddc35a9390eba5d1972ea1def
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which appear to be compromised WordPress installations. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation tactic to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=learn+business+english+writing+pdf PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4d8fc30e44ec7c50338e3aa496b6843d/29627451089.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee05b6fce---gezizepemidi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cea005a9---11557603511.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/64843065164.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607640286c4e5---silowimerifoxojafemaf.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/gusurisasigavugepugox.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/kofoburedanixifo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kotopabubatotiso.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/wameruwudeda.pdfIn PDF document text
    • http://siembra.me/uploads/files/83868056507.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d19622a76bd8b22aba44889e2e3d2b66/nowobupusejamovonej.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9035f2284f663d07bbdb6cffe69ae284/birowosajaf.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/92800053691.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a29d30806---36532239236.pdfIn PDF document text
    • https://ms01bet.com/contents/files/rikewirofem.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/galimuvip.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9020339a3d---pebegekopotavod.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/85025873085.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tvq24s84eqnl979m1t0tjcpr08/88955432821.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091de61f419d---36417201990.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/77264810291.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/eeb6ca0c61946f8a430b5e2d8e8a439f/lamavufebilifimeko.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_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 10940 bytes
SHA-256: d42ed316f0b1f2b25537d44999aa71a25b296378261ff7e1d382a7600ba620ff
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 17508 bytes
SHA-256: 054f8c69e618075a883eb5c856fb3ff542155ce02a9e7c1f14fc163e781a3452
font_02_sfnt_off00013376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.