Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3233b9c08b5d9d6…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61b7dc74c3ff7ba7ca0ee651e5644501 SHA-1: 16578de36a93531f44cf8222b1607ecb33c73a48 SHA-256: b3233b9c08b5d9d62783d5ff17625adc5c52b0e0ca587ad958185bb551f73e9c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of multiple compromised CMS upload links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac924d7563d---28676835114.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090021dceca5---59571870123.pdfIn PDF document text
    • http://christopherdallo.com/file/bulitanezosajize.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/kuvilirewupi.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/gelepunarotutaxugag.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a7a31e5302596f47407b02b75f69fcb3/doguwudumefurofatuxu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9984658b7---28692671245.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9a3073e340ab3d47e0b13f591e98543a/87462272057.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/de02d32d0d76c734edcedc41d18134ba/gumub.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/kerazomid.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c2e1ddacf2b0722b94fb50258e5f21c8/lokuxitusaruronatinawaju.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/69212267469.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/paxigegojimubamuxi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lnv65892k9nel7lfj4g3645ct3/sofetonodezejilifop.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/pakojojugizagum.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/xenipewesamowiruvalu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/de4b7c436f72f0f6a15bac2e7db50487/jevobozonuduji.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e8f1419f---62154197590.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/popibokobunijibaxanoxize.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nudibexunukajudedu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a617f11cba---41591084101.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wotewiritasufigewokuje.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bffa5a3eb---bimesenaronukedinoxazej.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f343f2941f---pefuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=american+pit+bull+terrier+breed+standardPDF 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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16696 bytes
SHA-256: e966ef7a0997d421823fafbf494c3c6869c9a00a5a86372eb82408c7b52c841d
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10776 bytes
SHA-256: 8e20593415c77b88dda62761eecf848fd5a96adaa816574a5ad6654b3771a01d
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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