Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db86ea437b515bf…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 21:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6bdf02b8769acfbfe6d57c585d599da5 SHA-1: 58ddea1dc1a4ece16b7d687740b52076f5e89b18 SHA-256: 5db86ea437b515bfbd0e9c8028bde302719cb130b7acd9b54c4f19e695267aec
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `utm_term` parameter in one URL indicates a potential attempt to track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=statistics+chapter+4+test+answers PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f4e1b114d---wiruzawumujepanezitonu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/58040303823.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f741eee8a5---xevisupe.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/fagisoxeza.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/95033167181.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4a695c6c---gonitotazum.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/98d6ed59106347bc3af66f411fce4194/tugamipugagazus.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210521141840495787wiglrl.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85893528903.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/77712338365.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mofenosuze.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/0mp09k5flc88213o9b3jv5o6vr/40161178302.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/84705280409.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gqjs3ddi0ojhsa6mm2s951eh85/jororatagejixi.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/94915195277.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/gixowewe.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/23593015577.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f4bf031f---detigew.pdfIn PDF document text
    • http://nktrading.qa/file/files/13653822924.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f372b89a9a---puripikuzigunibe.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d03d2d9---tetexatafenelalikemalewum.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/27332450521.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/78721781820.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c3ad71752---15542323461.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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 10544 bytes
SHA-256: 592d03c7c3dce427278d3ddfbd5784e917246319813e9580205ac1663fb49711
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 17816 bytes
SHA-256: b5e6a282d412fb14bc5145caaace51f20e81567ffe0c85f68f1c1291c61a58fb
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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