Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d957a647b69246…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 609fb49d2cdbffd74e11575c9f5810d0 SHA-1: 24c10230ab650e65b98f03396307509a2658d8c1 SHA-256: 96d957a647b692468cb95f0934e3a428676d55925919e97d54b930368d9aabf6
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates the use of compromised WordPress upload storage for hosting some of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ekachaiguitarist.com/ckfinder/userfiles/files/77494046810.pdf In PDF document text
    • https://bwawarszawa.pl/upload/file/19858878584.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/dizimikexuzerujovetarine.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kifabelumajikagisuxewomo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7fff1d8397ff8117e1305c5e3d26c35e/zajivobuzum.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/98181825777.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/11805517944.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/gakovanuwufaloti.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf67db0f6---jupozavemunopaj.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/90340661700.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/lotamekesimewigarikupuz.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/livojutetilexiwomabo.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/gbr1ge352652dsgkt21h2cf0o7/20081513713.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/77297119575.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/buvemoruxud.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3bf20b0596487869ec0f981769082943/nedebufe.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/71420405972.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ek2mm1p3jdk69p43l81507qdc4/26998066872.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/texizeburugibipu.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/totegiwedewuzefufew.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161040e3dcb2be---11790210761.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pqua39bsk9j4p0ptbdb147vlq5/93332186255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+unitary+form+of+governmentPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16556 bytes
SHA-256: 8867891525ee0efb2926e2a7f25081218fd3af175fa6d380994b511f35ce13a2
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10888 bytes
SHA-256: 034e0dc508d0bde15efd9ec65bee23e13f169ba43fc20331a88bad332d08e1b6
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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