Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b3b404a3df7cca…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 04:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c6c1b161cfac34fcab5c2c435bbb9d9 SHA-1: 000eb7ec543c18ccf2889012a4c90fe6d0240d26 SHA-256: a8b3b404a3df7ccaae6509efd80f7b44fd9f564bb65e3fdccf7ad836d10f7101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

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://www.sibirprokat.ru/ckfinder/userfiles/files/valif.pdf In PDF document text
    • https://taumed.kz/upload/2021/09files/210912045220905389mzwst.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bf3129a7c327bb7b70f67dba10f65b41/gijufa.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/34362835150.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/56646862914.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/21730427599.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/4547371364.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2ac9361e9---vexukubitufuvoxizo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149481938d5f---43478103.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dugalu.pdfIn PDF document text
    • http://rrarental.org/upload/file/suveronobunokugigibip.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/joras.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/xajixejuzeruxeradi.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/duxavijefivepowuze.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/24238043652.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/benitiwatuxujixuwo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/62650778082.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/vagojizunofadodudesu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/45441104332.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/fugurewesuku.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/xudujewojipika.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vodejijolofofotikakin.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/35076216106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+logo+maker+apk+for+androidPDF 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://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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 19364 bytes
SHA-256: 020830335954f50132e61c0e8cf878cfd1c2fd2cd1353a43dc1b8b630261b0ad
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 10988 bytes
SHA-256: b81bd3fecd4ff613127a8cbb29df48c58f17354e500dadd7ffc79508f924ec93
font_02_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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