Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df7622ef0fec4f4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 20:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a71d39a09b03c53c67d929426fd7e6f6 SHA-1: 4774cc5dfd5a2a9ff02693ae6a11b4f7129664f2 SHA-256: 8df7622ef0fec4f4711b7f56da03026e8ba510fe3dbc0b821e8ae255de4c0d84
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, likely serving as phishing lures. The primary function appears to be redirecting users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=hero+strategy+castle+clash PDF link annotation
    • https://mimpishiodua.com/contents/files/31887120656.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed58e3602---setuzevudirine.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/jozutojozatowujom.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109140535246132.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/54150339918.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/59719218063.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/mazerideselakarozuwupe.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/visadipifozukasakos.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/37057612758.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bujejako.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/7142801180.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jbrnhus9lt3co38a995aq50qma/30371413169.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/62406047886.pdfIn PDF document text
    • http://vitrine-prof.com/files/83544163157.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vamuxazu.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///56517039705.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/88003429709.pdfIn PDF document text
    • https://tsegypt.com/file/fituzibonufefurik.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/mopan.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2b46f44f---tizunuvoxarus.pdfIn PDF document text
    • https://zhansq.cn/upload/file/57111677692.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/56325987180.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/kukebuwikujabe.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_off0000b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 10420 bytes
SHA-256: 8304ffa3d8f74ce8fdac6694cdd347d045da6f16171b091fdd8fb92b5afa9eb8
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 16616 bytes
SHA-256: 77cde56cbc7f269a213091f822471762455ab82cd611b9dd9cee7403ce5c9d7e
font_02_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1