Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e678de22bc1632…

MALICIOUS

PDF

102.6 KB Created: 2021-08-06 09:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1180a1669367874e9c0653dbbcaa38c1 SHA-1: aae468704970454768e0a28b581b5a371d3852cf SHA-256: 16e678de22bc1632598b49bf91bd5fa052e8584e912b1a178b71b825b0a3da39
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.nagsa.es/ckfinder/userfiles/files/gakijodasol.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc9c8fa95---80208629698.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87758146177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091078744070---24228464654.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f2bf1640eb32102601198ba1fbe41ed/jewuxego.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/69287301210.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20faa83c7---kuwipem.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/89707152258.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075c167f1874---fesuga.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/mugoposaxu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/01e4e3b7a1d888d75e4904ac047ba5ef/98877903052.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2150bf50---muves.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/37224499822.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2f841ac7---69155957203.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9814f2185---debilujudi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kojuxa.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/vizamepebixofa.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/21056333738.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd7183369---bigivisumumenenudafubomo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897562bb9f8---1714768671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+desarrollo+personal+ciudadania+y+civica+pdf+5+secundariaPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wunapobavemujezinebikubad.pdfIn PDF document text
    • 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_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 18736 bytes
SHA-256: 486da118fd101fa9fc5fa126f285faf944e495dfb64c57fa1e6bbbf97cbba65d
font_01_sfnt_off0001579c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579C 11028 bytes
SHA-256: 540897f348e43e11ee0a49c3d865055154a4cde58e44e5fc262faa5011fc90e7
font_02_sfnt_off00017133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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