Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87a281da8d10f7c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-16 11:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 014a2f5d7d898784fb100d3b8fdcdd32 SHA-1: b653d19a7952b27d27909e3e8f63c568062b64c3 SHA-256: f87a281da8d10f7cd6051857aeb91082238c48e0ae487016c0de685aee08d4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75764140528.pdf In PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/44176973173.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/ralupetekegojo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/romux.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f077b52db---xofarajugeza.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af626e49ac0---bogusagasiwilowav.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/954a888094ec03dd9ed5ec36e1606c29/4065420942.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160841436a2b13---xiwaxelimajugegesam.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/7917655955.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p11bu8o9otjumg0igdgu685e72/wawegapav.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7a0525a93d0d344bfe3ca64832fff6cb/fusadavul.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866d66afa5---dejux.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/73024056450.pdfIn PDF document text
    • https://aokman-drive.com/d/files/85725949549.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/rapekosewese.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/60258544125.pdfIn PDF document text
    • http://dalaichau.com/files/95170524593.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lumejeta.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/17494562997.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/39324645e6e26e2e126ca4a33365922b/gotevatovosolikuluf.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/motaruwa.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/53125014942.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6ed72bf6ebd117b9487232e5f30e3013/88374066267.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/dd1173d051dd63c46dd1f8985d0984c6/31478195454.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606212020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=phrasal+verbs+about+moneyPDF 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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 17028 bytes
SHA-256: 0f51fcb5293fca8cd92fb926598b9c6d35d8f48bba222bd06a3267fce83c8934
font_01_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 10700 bytes
SHA-256: e20cfa737efa68272f47bfee36c7cc26d25c8f7d3eb8818678e89f0864eb7f59
font_02_sfnt_off00014049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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