Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba541e92a90b48e3…

MALICIOUS

PDF

96.5 KB Created: 2021-09-08 02:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8cd167f93393d8a2aad68c31fe64d62 SHA-1: 1afd0a557ada06f20815280275af86f1fa770698 SHA-256: ba541e92a90b48e3c11f5870f92c52a4929a7d35f98b053f8c4f74289b57933d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://benly-carson.com/product/files/62328144787.pdf In PDF document text
    • http://nusratali.com/userfiles/files/73556815792.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/timipifadifopanote.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51c747a68---31462151079.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lakekamaz.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/59220585513.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/649a6e0992807de8b71dafb0f7f330bc/muralufovakewutu.pdfIn PDF document text
    • https://koratspring.com/upload/file/pireju.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1c247ade29297a65edff5aa4e54d7838/faxegigir.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e285442100b---2335968332.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kowizalobagumolekixixix.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xaposulagafoxun.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f40d292dc---valapojagubodewidajis.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/33198713650.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160761f318c685---79869380080.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/60781542615.pdfIn PDF document text
    • http://dytac.hk/userfiles/mewigujowitefepemevisuva.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • http://alkanboya.com/files/file///sobipopafibomefet.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd235f161---97828034109.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/towekigiforosado.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/nikapigimos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=definition+of+psycholinguistics+by+experts+pdfPDF 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_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 18416 bytes
SHA-256: b7b86744a80f8a34bfaf950de155817d998be5c61289e2c82422cec7e8c56ffd
font_02_sfnt_off00015a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A72 11192 bytes
SHA-256: 14b047723c72d7c9dd6e0c882d4f00fb362e1b5df1f81e9cfbe4bcdcf630e710

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