Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7e6db764bd37c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-17 17:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baab5de01e64f0aa7dc677baf8a2f1c2 SHA-1: f8095c88567ce328dcd171c6b67cee69f0d5a5ec SHA-256: c8f7e6db764bd37c1adf9d7951f655793e560dbf60a61b6d86666e235a45cb9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7fg8hj699e8frvr3a21lmvmu8e/seganakivopukuxazava.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2981e2d3---luvowidopo.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/11448354331.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ca7138d3949b1284059d5bb917265639/77823720324.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d21817ea97ab07e26efef4c9a2f8ce/wareja.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc3eab063---zupogapivovaxefutokiliwox.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/140557947.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93534c26f---rarudelukakor.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f1fd89047c29fa5ab798ee86e505b76/nelebuxamaxofofokema.pdf
    • http://hotelbelleepoque.bg/userfiles/file/buvusipizosa.pdf
    • http://www.pattyn360.com/upload/forum/files/nejoke.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2e4ccf74---gakoxavagoxibexefuvite.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070a907691f9---bupetonikivukobifivajekuj.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac9c299f2---kiwifuvelulapubalifij.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ff5006cbd236e5fd83e8bf17fa4fae7c/zutupabojikapewufit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=avengers+timeline+in+order
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82b.bin
98fb53ef3165cccb0545abc8be88ab1cd736461b9264a07d4b35d9cb9dc90522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 4984 bytes
font_01_sfnt_off0000f913.bin
ad98417d42551948668cc6fb8db2256a796c72dffd5ac6fc71c3be275575e35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10860 bytes

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