Malicious PDF — malware analysis report

Static analysis result for SHA-256 99adf85bbba284cd…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 15:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 099d08bf7fdb47a6b1042cc5c0b8472d SHA-1: 24fa8c30b468e05f4914d3982e2a14c2835f4bd4 SHA-256: 99adf85bbba284cd82073c0d8749850b6bbedf4aa4bf9edf60dc4333bee319f0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, suggesting an attempt to obscure the true destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aea854a5c69---dunibutivudugat.pdf In PDF document text
    • http://mertcelikkapi.com/userfiles/file/4194713437.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6509c94554072d06a5f0c821b98cebf1/8308835184.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/82529547729.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71488434039.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d260e0be710e1ab4197d4abba45b6b86/38280521279.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ce9b4a3ab26c3cecfad6f7e8740509b/karegefeworiko.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c8756065---50896971801.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/29276469691.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/10932586118.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3b004b79d50be8a2e7f9efb48c2194b1/84364960718.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210811164203.pdfIn PDF document text
    • http://qdjshg.com/files/file/76717873248.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3ecd3f7a3---kanogiraremi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4dd628970a55d4ec7d06f0773bc04943/binenegagidivoxusirobok.pdfIn PDF document text
    • http://3sdent.com/upload/files/31443182853.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/24fd4ed330b8533155934b9d69a8f04b/76419506588.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/98562477795.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/tigamozewavefavenabitet.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7b8534c1941e994579923085cfbeddab/75332373056.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/damabejokimilomerufila.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fg5h8m91k4hq1q9eopudimut5v/zenaxekabowedubugesin.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/86417080426.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wasiwelegawumurinivikej.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/vuzexivexinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+screenshot+or+screen+record+on+snapchat+without+them+knowingPDF 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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 11184 bytes
SHA-256: b69aa4aff849e2a26de9c7e1f15e9bd7953f61ec1392247aaf913b2da9a0b63d
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 17952 bytes
SHA-256: 2cc6ccbb583f6a7067b22d2ea6a87c88a10c54bf57dd4dbd50b37ed69a444c1a

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