Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8724681ec3501ea…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 17:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01864f930f145a3c93c868c82e14add3 SHA-1: 0a571902e2fd52bd93a8fe777d46598499e0a4f7 SHA-256: f8724681ec3501ea229b2cc1e7ff566eb45e7efcd25a9c3ebc73c9ed8e34d2ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of embedded URLs, many pointing to disposable or compromised hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/43076289654.pdf
    • http://driscollandgibson.com/images/edit_images/file/57631922671.pdf
    • http://thuduchouse.vn/pics/file/bugefaf.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace60475934---wujejatolomafot.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/73099035465.pdf
    • http://petra-dario.info/upload/datoteke/bubemaki.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3c5be4727df8e748035d2ce8dd982ca0/57699460083.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/16141158827.pdf
    • https://rugsinc.in/UserFiles/files/34728444537.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fce97f6fc---bevexem.pdf
    • http://dispensapertutti.com/userfiles/files/mizat.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3856dc6777bad63a965d24f4f4f3aeb3/89871219171.pdf
    • https://mytalk7.com/_UploadFile/Images/file/11984835029.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb0e3af9f---3605398217.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c738b435f95---rotujezubudozaguna.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/daaf0b9d7cb7b5ae8a79370ee6e13188/13975311878.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/furavig.pdf
    • https://tanthuantelecom.com/upload/fck/file/86740552188.pdf
    • https://radio-aurea.eu/files/file/71711233340.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/78682095003.pdf
    • http://akcjonariusz.com/UserFiles/file/gafav.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6frthm95750o2q3leo4cf37jg3/26448447669.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b076f56d614de2e839c6d0fa3f165267/xosopapukuwodofi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=novela+dinero+facil+en+un+camino+dificil+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57f.bin
8e9f89ae4de11d0316f9afe1242e5d813f2e05a55a2ce65b6791520a88d0bf2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57F 19396 bytes
font_01_sfnt_off0000f679.bin
f82f438414d6ec5923fe74726aa6a6891e0006076eaadf3e603d18419044ca1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 10656 bytes
font_02_sfnt_off00010eca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes