Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e404913c5b599c3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 09:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0103c51333187445806bc4fe3c43dae3 SHA-1: 7e6a0a9424d784abf8184dda0205421443877067 SHA-256: 7e404913c5b599c3af39ca5dae5cd0f51b2bc372a15b24f05eb01634227d16a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver a second-stage payload or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://arnetbilgisayar.com/upload/ckfinder/files/bajeruraw.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbfe8d63b---jivozunowi.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/16465331840.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65768058726.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/ledamuwapuku.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614307d1103aa---95414876159.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/gekog.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/405fdfd407d5978e8050449b66c232b2/kumufedalogekimevemodiz.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/32450092379.pdfIn PDF document text
    • https://atavio.ru/files/file/87289212535.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/mobuzozesakelezeji.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/29427181123.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fekakes.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2nfnidscm1pmgeuljnv930luoe/34399779191.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/kimelopebaxajosatuzopap.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nawalivolepefulowugob.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94008884447.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/17891894857.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kajasek.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aff7c6430c21e9198c85365a257eb014/1505641894.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/20883385917.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/madanajunavazuxadinipag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+messages+desktop+clientPDF link annotation
    • http://forum-auto.ru/data/files/42478613431.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 17884 bytes
SHA-256: 073f8b4150d4f5290e1312d59d805764d1a1883e9cc720c2250af097a97e7ef5
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10932 bytes
SHA-256: a1462f88ccfc34684fa65291ec62b101c2ba71558233fb9d339cd04820bc8c21