Malicious PDF — malware analysis report

Static analysis result for SHA-256 8028cf1e59c9c2d5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 22:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40043fddae33c082ee67831f52ce9af1 SHA-1: 6372ca16d9ef5dc63b0feccf0f75627eb3f54606 SHA-256: 8028cf1e59c9c2d55b9f489f7af8898e3aeb0273874cc7b0669593cebcf8bb07
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it's part of a link farm designed to distribute further malicious content. The presence of embedded JavaScript points towards an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=maths+book+for+class+4+pdf+download PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2183e4de3f---43072343978.pdfIn PDF document text
    • http://gtshotel.it/images/file/19109188733.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/6096799861.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zivor.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d671888406c---memakaboliwelelesefogi.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/tefiwexodibebu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sviongmp1pjsnm6t158l7bf2m2/dobigezafamegup.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161231b2f6a82e---negaxo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeea34c061---pebanofudut.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080281ecb962---51835518218.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/18392182748.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160861efc3f271---57095874484.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/88590004233.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c5ad8ab3---tuwigekelulasujofew.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/sesoga.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/57335301236.pdfIn PDF document text
    • http://biomisszio.hu/tmp/mufugavewome.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8lquef1h43524j3hep947ua1f1/luzewi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca24c8f254---26474793222.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d7b97e84---zuzinakiwatuxegowiza.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nd3v2gvfu73jgua7hugmrdatvd/76599947625.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/65325114792.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/1558107097.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/mobuwaxudag.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/76119831971.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_off0000b8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 10880 bytes
SHA-256: 1c405afbe38db870fd27d52001e734c01de8203ef88932bac258cb6d48fcbfc5
font_02_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16476 bytes
SHA-256: 892a955f97010bab5e8cd56dfe3dedae036f6521c706bf1993ca6fc1bee762e1

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