Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ff1c1f5dd3b1d6…

MALICIOUS

PDF

101.5 KB Created: 2021-09-07 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4aa3bf2422199b8f3695db434848dbf SHA-1: 36fc9e137e8930f662bfbbbeae8b4a54d732437d SHA-256: e6ff1c1f5dd3b1d6613ad448173fa1805dc1bac85991f4f8818a252261247c96
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 functions as a link farm, containing numerous URLs pointing to other PDF files hosted on potentially compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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 http://sosnovgeo.ru/userfiles/file/39738781923.pdf In PDF document text
    • https://steammining.com/userfiles/file/votoxo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c177014---fasuriweviwurena.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ba7847695---73203011602.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/kiwerudidepuluxokazato.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/sunetefajixudetave.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/wafagetonijekubikoba.pdfIn PDF document text
    • https://motacademy.it/file/kogevaketope.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/27989435940.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217101030211873.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/novatudinej.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836295e588---busifobif.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/10727263866.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32702906070.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a310d---zokozipisegiwupepa.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fimemodaretubutaraxegubo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e56c36af6---97149591972.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/90200523297.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f744764ba39---didoroxobexusirag.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/16860004267.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/30035885524.pdfIn PDF document text
    • http://bjjiffy.com/upload/66680002861.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sapekijimopojalejodifuwig.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/30193255809.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lomogojokirosob.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/4751744268.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/58425279252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=read+purple+haze+feedback+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://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_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 10572 bytes
SHA-256: abd9f89c7c56d330ac706d2ea5c9c7f2f59df2e2ad3f389c9a71a2e960ce62ff
font_01_sfnt_off00014396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 18568 bytes
SHA-256: aab16915d995a6d5ee42363bb0461fb76b01b7eadc75cf91deabe328edeb3eb8
font_02_sfnt_off00017431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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