Malicious PDF — malware analysis report

Static analysis result for SHA-256 267f2b4e09c1950b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 16:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5adaae4e46ddf742534edadb8583599 SHA-1: 495f609640caf0c78a3749bb2cc62a4ed20f5d59 SHA-256: 267f2b4e09c1950be8081c798abfca3f5d155c0e6999a5e32fd6feaa29acc37e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation and potentially to distribute malware or phishing content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://aksukartela.com/images_upload/files/137178037.pdf In PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malejidawerizake.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/gorebe.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8bc597f6a38c515c7341f6ad33c134cc/dofema.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/96744923645.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/76699789273.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wedifakujiravorakej.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/navadidaxilofodupovov.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f384ea241831ffcdf797b063506dcffc/wasasadaparuka.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/62222137149.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/zibazitiwawusub.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/resiveke.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/da8bc718c0d04ff8176da48c897476a2/zejadafadutajufa.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/wuwanilam.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/xopofururojagatad.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fuzuno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613708ee5c8a2---88875622069.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/89755488992.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/72757533771.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d6a7f6aeed7d1e24e07f59fa5e3be6e1/janew.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dosadimibatovitunomitopin.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wirujurerinesotovagok.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tulezi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a4e572b24ca72f754db1fee40d4c7345/sevode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=penguin+dictionary+of+psychology+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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 11116 bytes
SHA-256: b361aad7da3a51d83d8e3889f18dc4a24a6703084fa89f83d5bc59ccf4e59e90
font_01_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 17136 bytes
SHA-256: 7569f081c91ef74e6c193b8548b08fb155e40c450c0e973ed45bbfef359dff2c

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