Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aba76cab69b93f…

MALICIOUS

PDF

84.8 KB Created: 2021-08-29 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c383b8c8287f592734e263ed58e8e2e4 SHA-1: 9b97f97fc5222287a09de1d3ecf32d7efcc9ab6c SHA-256: d6aba76cab69b93fe1f6c9b4837608bc70ecf865a265d1d5b7582abc9a8e8220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a25408f30faeb906cd25fac6e4d9c55e/rovujuxixewajulamori.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f749faa70677b3f9e2913442d0723e8/80194513966.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/30275118635.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6b9779ae0704ae6247bf767c0f221749/xanofavefaniliduganivetej.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/bujasoko.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/devodenuzunibiserajejer.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mizimoxoropeparujurinatu.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/topodawura.pdfIn PDF document text
    • http://starma.pl/files/file/bugewevilubiboguzokinor.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c45dfa8bc4e177aff0af56b8e478cd1a/6608916091.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/47658444769.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/nivuvofon.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/38067074231.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/253bd3a054004620d8dbd7725581d87e/kimafepoleburivuvur.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8ae60cb1c3b2d9b299c1e26587ce28f9/letiruzejuwibebasabeguba.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984233d608c---25151795069.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210712_14D9542970B8DC39.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lavuremalapovezupifol.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zabukividilawi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/nurutodawov.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5617a20657a65bcf6c5daa217adcb9df/18768736952.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/70783999141.pdfIn PDF document text
    • http://learningkey.org/userfiles/58218895703.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/188e05137f7f55f2170c23fe42b7dea8/zofigalatus.pdfIn PDF document text
    • http://labonscafe.com/userfiles/6000263705.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pajonimegumewewape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=asterix+and+the+soothsayer+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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10744 bytes
SHA-256: 6b1a7c28011ca4e4fb179d34ca8854938e49b7bf1988ad8ff652ebf2d680ada2
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 20460 bytes
SHA-256: 84ef57a8fe409ac487288b1f7f9f4952c180f87c59f8f1f8631c20cd728f5683