Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6d85e90a513be2…

MALICIOUS

PDF

99.8 KB Created: 2021-09-04 09:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1f82a96ac72d7d07561db439d1639ea SHA-1: b6159576341a71c62024640ccafd99ed5bf3e50a SHA-256: 9b6d85e90a513be2dbd2f7628e913abdd110da8468683f5b686e84a0341c3d92
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a ML classifier flagging it as malicious. The presence of a 'download button' lure and instructions for a password-protected archive strongly suggest a phishing or malware delivery attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baobiachau.com/luutru/files/xodalazidubakova.pdf In PDF document text
    • http://bulmarconsult.com/files/xoboru.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/62305842546.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623980992.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/43938391700.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2f1dd15e---wowobitelepegus.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/danupodikomikuwu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/93d7b778832a04243233967e8809004b/dabukowerimivaz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160919ec7bd54b---85908594238.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/kegodipasaxexojap.pdfIn PDF document text
    • http://gewald.ru/content/Files/dabipadobogogivudej.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/tabejimaf.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/zowabevelujo.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/pevadagovan.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee4a2d3e9---sudutupusuligukududavuwot.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/75579270251.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/xevaxivegomesajixejeve.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/26113997110.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/55792241349.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/wanudoke.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/64640035844.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/20666764843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chef+venkatesh+bhat+recipes+book+pdf+downloadPDF 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_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11132 bytes
SHA-256: af2b9efd5a2b4d2d6853b252ba7ed11b63db5cd9959ed14ac3cc6e792d6fd3b0
font_01_sfnt_off000133ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 20148 bytes
SHA-256: 99b92a225e79efe14b7c6f41503f43e3653085e15b54b3dac3dc45469e78eddb
font_02_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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