Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad026933c8d4556…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b0ed7db9dfd42fad4695d9bbc2b4dac SHA-1: 59cd59ca731d08d5660ce369dbad1c9a6e233350 SHA-256: dad026933c8d4556365cabd46d57cd02ea8354488845f7b2436e77f4fa82a961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=lowrance+hds+7+owners+manual PDF link annotation
    • https://torgradio.ru/new/files/file/fafepobiwadiwimikisut.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/54324404462.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343916dc6eb---41839743274.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/11275437798.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xosobofafopukurugogewaj.pdfIn PDF document text
    • https://blugarden.eu/file/51629960485.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/40562072378.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d2b4cc5fe---jorexusuz.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/51929155025.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c897ba6cea0---debemoponog.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/madus.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd67ae2a---84440851817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502c3227d0---sakubobise.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f70717c27---94864420214.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gokilewo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/87053908605.pdfIn PDF document text
    • https://lifeteacher.tw/uploads//files/202108061452292059.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/53065958915.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/wojunifava.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/gaxexe.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/lukexe.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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 10636 bytes
SHA-256: 1dd7b15c49bbb1882c890d101b2e26718f279763c0bfb7270241271a7ea3b780
font_01_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17836 bytes
SHA-256: 2607955c57a949bed359f9e6d6c42d1a1bfee6553dcd8f12453f8d0577201081