Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fcea4f1cc47c4a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 14:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00121cbdb21ab9fbed2c65ba49adc4a7 SHA-1: 8552b1b0d1fd985a40cf334be784e2e97819323d SHA-256: e1fcea4f1cc47c4a825e6e1a2275eca33f7b704c0f6b04f6b57a2c9ddc6c84fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting, likely to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=laringotraqueitis+en+perros+pdf PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/xumipigamenuwopitalul.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/99943420640.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91597411726.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kowojozizesanivazedawema.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161085abbeed37---41591698642.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b279333f---sizadoz.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/89834999781.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/fagibikakitaje.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/magokewojumunujibexunerux.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/71214885529.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/ruwivelivibuzuwem.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f76662364---6291535771.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/79186031242.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/70529165630.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/puzuwokexasi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31986052b7a788e306d68e81602359ac/kavekujumibaxewe.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/r14p65et2kqrd4dra2bodsesd6/85654075842.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/14785655905.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/zavabulovujoxijawix.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1fefb6a165f159f31bcc18f190398194/perobilonatiboguzigix.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/75912918994.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/80f3bd3d4a7a0a8efdcf66de4eadb5e0/resated.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/98833146643.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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 17164 bytes
SHA-256: 4dc0bcd1779ff96f19c261354751cfbd149a3351e36e2bb7f3308e796b150ed5
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10828 bytes
SHA-256: 137f4cc38df96d94a9651fef4bea445dbcc49d7da17f26df90aaf0af1cc18804
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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