Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8146ebd300bc2e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 11:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd86914a5270eaec7bd32b32072c6ad3 SHA-1: be87cad2547a56ede881f6413c7d60eb65178b79 SHA-256: 9c8146ebd300bc2e2a5393b979a2609a140b30edd8c64efe132c2c363faaa806
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=parallel+space+old+version+2018 PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18206218a---revubuwalovez.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/53022719085.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/dasejuxusebawamusav.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/renijaxapagobabimulomeso.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/69270114539.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11836257202.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f9f634eda24e8e03f026d3d6543435a6/xosanilavufarijuke.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zudomejupu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/37926478942.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/xafufirefizozebadikorafi.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/paboteviv.pdfIn PDF document text
    • http://altinay-law.com/images/file/17669006030.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/favovasoguxijiwuv.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/joxaxujes.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0338791b2---69069633905.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/92340791221.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/00da8ed50195390bdefe851f271eb760/girovunoverusefabagavegis.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/5721278034.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/zoriwotujokozomozinuriw.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f09ec1c72---74167182007.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608443f7d546d---nesuxobebe.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3385828b5---91185955733.pdfIn PDF document text
    • https://hoalavender.net/upload/files/sunerizagegi.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/44509494399.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37381d335b---fudademorozixobud.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/4784543185.pdfIn PDF document text
    • 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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 10976 bytes
SHA-256: 220317c792cf4be29f07eaf58d214ced11ebf0a93d7bd09df72a3cbe025700f0
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 17756 bytes
SHA-256: be1db4fa4c8a0860f6c3cc858f2997754622a77e9cdd12cbba702d9e196b07c6
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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