Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a5928b3b18a120…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 09:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db779ed6892d2e58e1142a50865ea0f3 SHA-1: c86345e1c14c1a63430239f49c05993f19cbbf22 SHA-256: 87a5928b3b18a1201e48775dfed685c06ac89f3f333c092d98c2af603b705f3a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised or disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content through these chained links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://portofcrotone.com/dati/upload/file/35519800176.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/ruwudidejij.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/merufotepuviwuketotaxu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92e40c5f9---puzila.pdfIn PDF document text
    • http://toroisg.com/public/images/files/31011713595.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/61323471778.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609feec0cc3f0---2944120071.pdfIn PDF document text
    • https://msvadba.ru/files/file/42766559879.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9goi8b0hrfera9ccve3ikj8oce/movufekejekosegajojive.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/17f660b6af28f29496e3ecbfbf5fb1da/rimuduninikukufa.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/98088976348.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991c9586cd8---80741875888.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/gjnq934qtj8mgnv3o9qqh712bf/28150735320.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/zopukinip.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0ebf2a1e40ee5d8369dd4d704db3585d/mosofapaxafulusa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f0ae4e5e5cc2a432daa0ef7b80e844d3/79078814912.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mimoxekubej.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/28646675040.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/13546574121.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/19883260384.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4dee6dc896e43c2b60c5abcb78efa984/36290586234.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904073611295.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/15164202984.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/foponezotepegopebok.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/sujofakoronavozerolitokol.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/nosabibanatoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=canara+bank+car+loan+application+form+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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 10744 bytes
SHA-256: 7e49b91d7d8f6095bec3b9c30d861b7dd0189f435a7f65590e7a8301ffa802a4
font_02_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16128 bytes
SHA-256: 80736edabcdcbcbff594e200140066a72d7ebf261d83e1f7b48662766af85811

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