Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfd0846cd8088b8…

MALICIOUS

PDF

91.9 KB Created: 2021-07-26 21:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ac13fa405db83a25d2256282491cb45 SHA-1: 3c3a4c0a8a30f87a62433f75a06cffce2b3c5200 SHA-256: 8cfd0846cd8088b883732cbe02b4eb2dbb159f997b41603138c6328c9e67461f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple potentially compromised WordPress upload sites and other disposable hosting domains. The primary goal appears to be SEO manipulation or hosting further malicious content, rather than direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/93868101928.pdf In PDF document text
    • http://cc-loges.com/uploads/file/zaxinuxeroruvudobakijixo.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/mefopofepibigusifu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/edoqiu6nae382kql9d7k7rfgo1/84582996007.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/30508793095.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/51262836108.pdfIn PDF document text
    • http://npas.ru/pic/file/69946849977.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e114a68c---702953398.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/353vo83n6tgbadhc98qo41hfab/8708915345.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/142766f10baa3e31b5892c8e89ad776c/kodelotuwep.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c882d9df111---kikep.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/522oq43trb5dm8qr10a4k9i1mp/niporidax.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/80410028321.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad9e9b60e222d75e035eaa0d7d3cb051/zafibipusuxabobelofow.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835189a7a40---kekogixarof.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5dc69e6e---lumirimagubafef.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/jitixixa.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/shpppbjqtgse8e1p0nnhpfh7f2/jatebiseronoxu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pezufepu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/69324eccfda945a3ab1e36cee44a99dd/23785475787.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dec0f9ff1bb6a8bd4866062406317568/kadefezo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a38ea747---21178644407.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/25099793348.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad16cc0c3c---66447478734.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/kokakajidonemiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=where+are+my+favorites+in+internet+explorerPDF 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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17540 bytes
SHA-256: 94dadb15e30b75c85e69df1f37112335b021cbc57c04fac93b4495792d3e6d8a
font_01_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 10896 bytes
SHA-256: 8b51ae3cd7529fed9112bb2cf081eab289465f302a8b92c31ba0549940c08c7a
font_02_sfnt_off00014937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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