Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43d4ee68a8c2369…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 23:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4904682784a652368e5d986e93b2763b SHA-1: 63fbd432955537f90ac72792f3e2b5b1b2d81298 SHA-256: b43d4ee68a8c23692deb8a159f6266ff8541d1b29e4bec5da754f3962c1afc2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://optical-axis.com/uploads/files/202108230726087380.pdf In PDF document text
    • https://yingzhaoliuart.com/upload/file/61097661525.pdfIn PDF document text
    • http://etkenkalip.com/CodeignterProject/vizyon/files/12869012250.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/zojijudugiromurigowuzeba.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/6rdn2ulnvo7babl6fad4dqgibq/76323144267.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/25796975541.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6651d59ff957ee9dde3a204c35cc3b26/jiribi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28614251a0---luberi.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210810024934.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/11391030292.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/93920846043.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gv61jlvcni7lqg7nk2bbnt6ira/15460988171.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/xifariv.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/848368f3cca13983b9d1b11736844d7f/4368212310.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/xinisoposedadudikubekaba.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3165b08f40a37fea92644a8658363dd9/derufe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984373d9843---takuxa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sp5hrtvk3mquj5e24p98v5cf03/60046240484.pdfIn PDF document text
    • https://austarpharma.com/upload/files/sinipeduwuribuzip.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/388ca94e3bcd72042c0c1ffe64d15a84/44576081609.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/300727495133.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4dt88l4omubivmkf3upqj0poc0/soxujojubad.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787db359255---gobumofumoga.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062709505078539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=time+management+training+course+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://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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 10980 bytes
SHA-256: 52811c6a55d2ad6c943748958228827ab3fa6f3670da30ebce14b99f6008e491
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16992 bytes
SHA-256: b8120e9e97e51716ea5d6d85437cb97f58ae73a67e5d799dad18353f44a717b4
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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