Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a913e8a8ffe5cf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 06:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a67f39c93b1e5d1c1f8225c8e08af980 SHA-1: 68687f8a2d11ae7e388bcbb4403a77a278a89ccd SHA-256: 32a913e8a8ffe5cf5cc23f23aa78a7ac92f224332dd2526172b132f7aa9efbc2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS upload storage, likely to distribute further malware or phishing content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26f3cd916---92011480622.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/muzitulozodakerodirex.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/76917348692.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ddbf14faf365c306c607904b672e395e/57920980339.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611edbd163d66---95345848514.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/doratinelidide.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210821_E6A26C6D2CD6A588.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/30154518345.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/df2037bd86bbf6a4757271e0352d4085/resekod.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/49822296058.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/fuzilofatemuwijazemu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/81384132565.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/085eb8bd8953953bfa59ec7dbd31e015/24889921092.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/84738742453.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cf97a3b8022c8b11ce5de8080f34f49f/78679835562.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c238dcf2---rafikazejeladifedaj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/35fdf03b8b85a08361b60752e68eb36c/48057927418.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df1467efc---26131741415.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/8668546943.pdfIn PDF document text
    • https://atl-50.com/files/file/jagokozuli.pdfIn PDF document text
    • http://devison-matras.com/upload/file/80757094276.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/patagejobuviji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=las+figuras+retoricas+en+el+rap+espa%C3%B1ol+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_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 14868 bytes
SHA-256: 492a38f6b24db026576ea250741b26f96ed5fea2176f7cd6236a59c1895146ca
font_02_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 11056 bytes
SHA-256: 5b7cc1090fe55bdafa8300fe828f26593d50588e7849ea4793d7c0750d2bcccd

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