Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f18e395ed9112b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 11:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c87aa9bb17fced16f26346ad4a28c8e SHA-1: 5b6d6f021122c3ebd89903f8e2cc696e824900c4 SHA-256: e2f18e395ed9112b6b83bd0762775926417a1156d2c13ba69cc23a78c86d990f
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 utilizing the FormCraft plugin for file uploads. This suggests a link farm or phishing campaign designed to leverage these compromised hosts. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c03804e1---30925929050.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3e40c7e8---jenubet.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8db010b98e---lapalojufi.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/27952246771.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xuminafinoxabivow.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/21041138664.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/51146913628.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d72e0861c---faruboxigoteraxuwubinus.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/58623013016.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/xopaxebewuvawo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad147f9096580bb894b7ffee3049a9ec/mivirawux.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3ccde17f---verujinopatav.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/negotamozunurunubebaxeg.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/32010335860.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/63350147350.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d91005b4c---fobenamotebapuwumowufu.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/41937478190.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eae9e2b5---49120441126.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/pokopadunafur.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e904cebe7bf---zogomemukepata.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18965218401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=subchorionic+hemorrhage+dischargePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/81284276229.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17496 bytes
SHA-256: fe2f18500ff61bdf2b8c7594a8b60a4f8aa245dd3028805bfb10dda8ea250c33
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 10988 bytes
SHA-256: da944c2e5a1f0372d09f40db64070b0ad8a90fa18eeeda2841ee6f856bb1f824
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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