Malicious PDF — malware analysis report

Static analysis result for SHA-256 e005b8870731e931…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8071168c76d1cb6091b9b67b3adf8bb2 SHA-1: 492d0ac2e6b03d57779e3635a0b9e96c91712310 SHA-256: e005b8870731e93193897713917b4207f3fdbf9937d4629b6e8101480a784b4f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites, which likely serve as a distribution point for further malicious content. The PDF structure and the presence of multiple external links suggest an attempt to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5ebceccc2f179d4b31bd1ac828515cc/8890690058.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9614ba63fe---78331106006.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/baparalovizo.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/71356852962.pdfIn PDF document text
    • https://manenshop.com/upload/files/torivotelakerexusara.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/63336349182.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/gujor.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/9091994786.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/22767547669.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/439035e11cbe4931ce1435c6b92fe756/61719706504.pdfIn PDF document text
    • http://www.heksan.com.pl/file/1068783613.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/73750163337.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/874271fce3608e4c9d174bf55f234e38/16063872638.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u0jr8d304mtb9bb521mos3329f/zorukalodeno.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/31827034299.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/99586951583.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adad1401630---gojom.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kuxanuluwezoteravazenivo.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/suvenojoluluwuvinet.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/df609ed11afda8c98b5f0fb6e741fe39/4949359678.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r0tkn4a1irckrgrf59sr25ila0/84842082809.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/35647471979.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/clmkiglck0g4mantjgg7gj8uj2/kujafobajivuxuzukosume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+leave+a+party+in+hypixelPDF 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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10540 bytes
SHA-256: a47707b2749ee4e748178cee054f8b29a102a2e66cdfe0348469649e1d9ca678
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 18264 bytes
SHA-256: 5ec155d771b45e7725f1bae4591f62d92fe2c94d935267bb071e26422f220950
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1