Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a57ab7045ed199…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 19:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40fd4b45a1d2f0620b1071120d61ccee SHA-1: 5eeb9276206afe01db18d7274949ac4df5d291b2 SHA-256: b7a57ab7045ed1995d636e7b9752a65b805788cc329ade272378375eb656c544
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate it's a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://driscollandgibson.com/images/edit_images/file/vodilarabupozuwo.pdf In PDF document text
    • https://blueparadise.pl/userfiles/file/50932956807.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/pufuvefuvilirinuxataku.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7dbd812e---toruxab.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a4ea5a34df3bbcd7ff3c080f80f12e34/41951163744.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1c69dab95da0a5adad83aaf95e8ea39e/85501332337.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e8564fbc7---1133997228.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kulamuzebivupawuromatijox.pdfIn PDF document text
    • http://jucal.es/images/file/63337442308.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/rapevufezejebafotamodaj.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/9390457560.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/ladopozejuvusidagade.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f8d3dd97---79239678189.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1c73a7dc---68077296502.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fotelevuxifat.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/47476906449.pdfIn PDF document text
    • http://strap.sk/uploads/files/79331695196.pdfIn PDF document text
    • http://chinalabware.es/d/files/87092712079.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/najadujijoxozevexedubumeg.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624505621.pdfIn PDF document text
    • http://bjallstar.com/upload/file/16575439917.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e8c5045f---70239293742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pilobolus+fungi+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_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 10424 bytes
SHA-256: 87b7a18aa8f0b48acacb75043da21d6b0d43de26c73e573ef3e7141cbef49a36
font_02_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 17488 bytes
SHA-256: 2b8ad65d2276ffe761bad7cc74f763b2a1e0efede5954e9990f17a9f26c7d3ef

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