Malicious PDF — malware analysis report

Static analysis result for SHA-256 a435298e0dc8d4f4…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 16:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 703c2f3f2060d2cf73cd85c849b15ac3 SHA-1: 5cc3805870b5f039f0f5c1b4a20afbf78337bc11 SHA-256: a435298e0dc8d4f470b30cc92394964eb66aa5e71cace5d87b31a8b63b8afc7e
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were directly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9203

Heuristics 5

  • 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
  • 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://mclarenquartz.in/ci/userfiles/files/72579367409.pdf In PDF document text
    • http://thongthien.vn/upload/files/namokodijuwulid.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210910032457.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/79740399187.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/45673395446.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/20028114857.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/lusaze.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/59491606568.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/11994662274.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_120243.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/75260127066.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e969325b---mafavezebiner.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zebogisik.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57276869078.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jusagusosimasimalobaves.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614735adc249b---25256691191.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/fowajapikunalawugaxazozur.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_EE51CC96F1826CE9.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/sibiwikimutazese.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/fumiridalijif.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/304bc605f7683e77973dedba510face6/94297830553.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jovesefakilugus.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/rebulaxiz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ac4f1fee7---rumamovomuvupuzivubono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+fortnite+play+storePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 10540 bytes
SHA-256: 8c8213b6db9ec1e81a60e6ea27d432a35eb18b864f8bb5b3092568d1be69c779

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