Malicious PDF — malware analysis report

Static analysis result for SHA-256 089c4f1e9d385bef…

MALICIOUS

PDF

92.3 KB Created: 2021-08-04 11:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 488f81a7e2030e6fe05b6bc497d556f4 SHA-1: b7971d8175c286d7a9a7dcb4198b5b502c7d65b1 SHA-256: 089c4f1e9d385bef1d2ec4043fb59cce0d4e5fcbafe75bfb22363480dcf24675
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common vector for malicious activity. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites, and is likely intended to manipulate search engine results or redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2823e8f82c---gedewasozixuf.pdf In PDF document text
    • http://thaide.org/userfiles/file/josirazutar.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kcd4checugnumsf2de59rdf864/geduzofixepajuniwuw.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/64024083274.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/32321604350.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/52853492860.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bcd383c6---turosofepigew.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ded098748---87661379897.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8ec0b732---jadanobolumemelelofunado.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5532438f1bb4ad17c4694e662e318a59/pamelesivavej.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608425c1268d3---lidurulokaw.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/torukezovinoreneva.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8bd29e65f3d9187bae65f80fec9083a3/putefedutud.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/g9nn09njprjjsf7i2vdfv7e59p/53411340445.pdfIn PDF document text
    • https://led7.ru/file/25654179841.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/juwumojinir.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zakirogenoninolib.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/08b8981f3fa3327adb6b563533785fcb/65386688934.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210619071536_rtibhs.pdfIn PDF document text
    • http://voijin.com/userfiles/files/82889132561.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/5779777044.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dae51dfcf---62428494096.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9148c7ae31---79991116545.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/jiwaruwozunerepiretipon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+play+doodle+jumpPDF 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_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 17272 bytes
SHA-256: 1bbe1e729c1b1c90d38298ee073f2d0b55278c2127562c92cc94632334e6f3d5
font_01_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 10508 bytes
SHA-256: 8eeca07a9153772d4757a77496debd54e90cdb6d17ef0e8820f1b0c0b204ce15

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