Malicious PDF — malware analysis report

Static analysis result for SHA-256 3989d41609e68fe2…

MALICIOUS

PDF

96.1 KB Created: 2021-07-29 19:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae28725a9dc862a3fe13b8505600d14b SHA-1: 5eb5e206b5d8d491aa8556d4efd5902368a50c15 SHA-256: 3989d41609e68fe299271651e0914de452af2a2feabceb1872e462fcfd6770da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple external URIs and compromised CMS upload links supports the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=introducci%C3%B3n+al+derecho+comercial+colombiano+pdf+gratis
    • http://muszempilla.com/files/file/61089144739.pdf
    • https://retta-bg.com/userfiles/6142849430.pdf
    • http://mtcnx.com/upload/fckimagesfile/fonisovovurixoriw.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32154d5f6a---94896900259.pdf
    • http://droneducational.com/admin/userfiles/file/28166884781.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/jupasud.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7daa8b08d9---sonajadoles.pdf
    • http://elencostruzioni.it/userfiles/files/73118118878.pdf
    • http://elesi.eu/fichiers/files/88108507277.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93f603bf6---tujunowulidosixigobuzupoj.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a9da2fe8---zigekomepusixazexal.pdf
    • http://royalwedding.jp/images/blog//file/resesukuzobetafu.pdf
    • http://studioarchperissinotto.eu/userfiles/files/woxejujeloviduvuw.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074927c1852c---kixomajexuxizapawapurazo.pdf
    • http://richwoods1969.com/clients/861079/File/bonawulewibo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ca3569c5---60940567259.pdf
    • http://armanetti.com/images/joxugetegugob.pdf
    • http://quatanggiabao.com/images/uploads/files/gasasadamelulanafu.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/68555038957.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bcfb6c34---luraribisogixina.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_off00010dc9.bin
0dc2934c35fa2c004fe79202a940224882637965aa45aba15b51ab3b6ca5edfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 11396 bytes
font_01_sfnt_off000127be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
font_02_sfnt_off00013fd0.bin
d6276a35317fed400082b8f6377c546eebc3c62e4c89e3b793b6ff590cc71a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD0 19176 bytes

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