Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d5632e481a9cee…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 02:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90a896f5b6381cff44081b3491778e7e SHA-1: dc6edd9ac31cc60e6d828ece04d9e426af84927d SHA-256: 45d5632e481a9ceed7df18d22bc53cc5c2b772aafbe8d1888075cdcac05bf3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cv-vezouze.fr/media/file/vagejomapixijevanarixilo.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c6cea030c5e451e4095ff51b82078657/46253696123.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/xewegigabimedunavuf.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/jizaxor.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/voxafogemetiwefurepaniwab.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/vabomapajomotagepurutu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pvld9memu5uvpcnvrb1g8hbvdj/53856996829.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb0d3ac36---558079241.pdfIn PDF document text
    • http://topp.pl/_topp/file/80281060032.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/79035863844.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb172b6425---62536679067.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/wonuwarenutogotewil.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/84071573728.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/86469542796.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/newenapupikazufokuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=filmyfy+new+version+downloadPDF link annotation
    • 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 17436 bytes
SHA-256: b77ffdedcaeee0e487261a35bd516105219b481133b2c73067a970bfa5e96397
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10660 bytes
SHA-256: 9833d1fef7c3bcc79995c7445d1e0647efe5258c3b62e4ae549c79319f83225e

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