Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb3903401e93a71…

MALICIOUS

PDF

91.1 KB Created: 2021-09-03 19:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2d983e7f9ef2e698d39ed6b4f6d0858 SHA-1: 9bd184cb1c4ac3a437220a174b96c04df607f458 SHA-256: 8fb3903401e93a714715874cd2d57c6f9ffa5a4bb36e1e7b6959c6dade45b710
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://panegovernance.com/ourprojects/chowki/UserFiles/file/zaxerakoneretopenozizivel.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/6375940437.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/18331897389.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e9ce677a8---78583385986.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/03f093eb33832414497b1358304c95e4/jubiduzes.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/laxikuwenipufasuja.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/94200498940.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a7a0aa18---9367942519.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8c6047de---xamukezetifanetiroz.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a9365264cfb09a8f0b6cb336c4b3b227/64042790272.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/97456651304.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/6f5391699c63998557174cd77add6230/56536348311.pdfIn PDF document text
    • http://jljemc.com/upload/files/98296122240.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/23895568512.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0a27bdbd59d197c4fd488ab9d956ea1d/79777408519.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/h5u519m76enlm2pl948his8d8v/dapejadewigurenuv.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/suripedebakipowekilegudu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8d0b73fa---29760733837.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c9t5ut2f9gdbgep5pud2gl43c/69473710464.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8113a400f---35310266259.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/naduguvij.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4h7g36l1uepkabvoi8c61lpkh5/lasunoxejopimefumepetagi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/89624123232.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kewanolunutepabuv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0667b5fa---14782397282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+structure+of+scientific+revolution+by+thomas+kuhn+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_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 11360 bytes
SHA-256: 624b92ed881f9d4b48763502f07bb4c3564e658dd319abcf6847ff9e70b5968f
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16832 bytes
SHA-256: 65fb40e8e2f1aba22264796370812a3386e67cc091d62929193b2290f8843a96
font_02_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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