Malicious PDF — malware analysis report

Static analysis result for SHA-256 f396d03abc6bd3fd…

MALICIOUS

PDF

85.8 KB Created: 2021-07-30 00:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8adce0e6bad7cf092583cd10c387de8e SHA-1: d0acaf0ae16fcad3337c29f6b77ec20d0108e162 SHA-256: f396d03abc6bd3fdcc5f8668e9324e84ab8694d760550033a7d8231c346d2a96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cpspcb.com/uploads/files/wewagonuzidexusoxed.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4a4bd2d8---vexapugidugadiduwupawidi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/2848035820.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/83863916223.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ed08f96b5b6e08faeb1d2bf479a41602/13988815976.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/napubetisoxisewewos.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5a2c49b941988bd149aa7efc078210a9/mudika.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/kumib.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/denapevut.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8aeeb2b71664ab713acdc52212ad97cf/lujimirakoxepifipiwawije.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/29994760553.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jimaxut.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f50d00ee09465e12c4697c6d941548f9/13884115746.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/wiripidut.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/2354176900.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bevemeronomunazovuv.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/virezezerufonigutodutem.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609468fb3c278---gowisodakizodud.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/494cc1b17dfd88e96bb453e0ff28eeda/98353240829.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jewiwarokaj.pdfIn PDF document text
    • http://drtamerturan.com/file/17990611122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=robux+hack+without+human+verification+or+surveyPDF 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_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 17056 bytes
SHA-256: 4be3fb6f7abb6588f1880c538e9371c640fd310310152198052a793b4e8cb154
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 11300 bytes
SHA-256: d8ceead19a9bac2fb5a2023839f9bd912eacebef3139527f5e8dee39869687e6
font_02_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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