Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccef096b62a04de7…

MALICIOUS

PDF

98.0 KB Created: 2021-09-11 14:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d997102f1edfa715957a68d2de29337 SHA-1: 4c833933492596fdc2ee35464bf609dd88c4911a SHA-256: ccef096b62a04de7dd8d6a6a62e5816679be59c0ffa9f5c8563640aaff265e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The primary function appears to be redirecting users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medpressa.ru/files/file/sukekuwiximonagogazujunuf.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/ruxizamula.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/71932078613.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/425529877bd0922a4729af34791e0444/xogowamavefekomegesudawi.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/66484377962.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/806629b6b626da2b625bc84a1996e162/lugusotikobolekugovazo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/af768db1f8671a013f3cda5399ce33d4/bixiz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fl0ntkiehadgn3pi55uprh2cq3/10264186866.pdfIn PDF document text
    • https://kokomanis.com/contents/files/74465546639.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5dc0cd80e8685ba468f0ffc0e96ea554/momenasefoketebunife.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301e793aeb2---75869070450.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/firewevapopulopan.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5fec4d951---gebemo.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/62441834926.pdfIn PDF document text
    • http://fnathservices.com/upload/file/35000288755.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/maxinebokot.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bac0101d---15754428824.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/17630333101.pdfIn PDF document text
    • http://d-innovation.com/upload/files/20646046086.pdfIn PDF document text
    • http://dogable.de/userfiles/file/sijipa.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/gitezipike.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nufifodopolopix.pdfIn PDF document text
    • https://istanajp2.com/contents/files/90258299411.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/72688991435.pdfIn PDF document text
    • http://kaies.cn/upfiles/210902122834750284galyui.pdfIn PDF document text
    • https://suncables.co/images/file/dudevukexinigabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fallen+angels+movie+streamPDF 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_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10492 bytes
SHA-256: d8b4bd66e9739cf724d1c836a6afa2f48700b89ab49794ed1db0c6dc840702c9
font_02_sfnt_off000146f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F6 19644 bytes
SHA-256: 512141b751f29888307de129bda7933d33f66c3f57e8b179e7eb1bcf634cc4fe