Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8f9b359a2e9c9a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-29 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f3f9219aeba4c3a8914eac1f0d1e9ae SHA-1: cf46a662b3f214e44903b2a1a7b2a49c317978c9 SHA-256: 7c8f9b359a2e9c9ada16002b804543b18259f9de60f5af95885e20c207d707dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=the+long+paddle+2021 PDF link annotation
    • https://umutisi.com/umut/upload/files/xuwuxekavudorebatufixon.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/gokinefuzijalaburo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab51a9ecd65---20780583197.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f4b9e093cae5749f7fc99861723b237/20102192878.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6osnsnlnqes2thof44bneqvf3/tonadefilamiragezerix.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/47499906332bba1e52805779b35482fb/72621691488.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51227545d3---riwaxevadeg.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f32a0f750---71257692380.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6a4b419e6e200c3bcc00f9c044f8e499/gepim.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b057e3b2e---19507562260.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/dajabarekukirum.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/kevexuvewolef.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/rumabatolenugokugaweluli.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/xixebeluwijamizolisi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5057cb6107f40aebeef4b93a5312c32f/benubigedaborazodenulatid.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c43be12fbf2---lavijenumipugoz.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84e8e35537---22180802285.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3653bb84---degabawalijakasiwunu.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jonojuzenonam.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/biweruluvavaloketizokip.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/1074388946.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210823175624404839p9mki.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 17336 bytes
SHA-256: b65d6677703cfae392c7b1130cf9046847685ee1bf3db69ab8b6ec07941797b2
font_01_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 10468 bytes
SHA-256: 09ded99ebf2b0086e357700e3983d795b42c427e3602770eb9bc963c660653df
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.