Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb3b992793423df…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 11:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14dde96a2e92c1d476de1c80e0ffe3b7 SHA-1: 80cb488fd76a547aaae2fce5b73f35c76de93ae1 SHA-256: 0eb3b992793423dfd2d862258ee1d1e27658da927e6b8713dfa0a9115dec5f57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0e9870cc9f88a6a39f0f858cceee8d1b/69532815137.pdf In PDF document text
    • http://tyros-club.de/userfiles/file/34512507679.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/mumepegenop.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/37359172125.pdfIn PDF document text
    • http://mousike.it/img_ins/files/78917895891.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/59201739431.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kemonupap.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92ae6c65a---21906674348.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84030106391.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0376d841ba---dewugijujavuzikaj.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/67759709926.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1cdf172bc4960addc7be0435903bfebd/nipuxa.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/pumusawiwavifemaxesujop.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/60fc7e8debe184c082d549580303751c/vevunibokiditajakegag.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18fc9744e---wofemenozifobevipinewarib.pdfIn PDF document text
    • https://keongracun.org/contents//files/gozipok.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/89510403766.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/20472402985.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/17251677989.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/filuvutugubezatuvoru.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/78162990749.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f3a1fcc2b2b07c9282b76011eea6625/wemufelimitesaxobimenuma.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vajodidipizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=linistea+vorbeste+eckhart+tolle+pdfPDF 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 19208 bytes
SHA-256: 6d483c2f0d537a8f774985d8c6003955396a14e6f50f8879a015e119b822a7b4
font_02_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10972 bytes
SHA-256: abbae57c0badf19e5e9f273872899dc3fe5f53b234cb1f0f5801fc6b0fcfa317