Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb5906d75b4e032…

MALICIOUS

PDF

85.9 KB Created: 2021-08-18 08:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2344048d06b31896fd88a525d26751d1 SHA-1: 352332adcd9525df0c75a135da7ee42cf94bcaee SHA-256: 0fb5906d75b4e0320d1220869e46ca6552ca2fb3f2fc77846e3c115121db2f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to facilitate the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2jis92bkdcqcvil0h4ru4js61v/97011981293.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/976af7adfb51fc9fcee3c86f24bb5ca9/72505387600.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f994638e5a---80714810856.pdfIn PDF document text
    • https://plasy.com/uploads/file/pofagelimiveg.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/suralagibibu.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/voginemokus.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/zagonipijejenisamibo.pdfIn PDF document text
    • http://grupophi.es/uploads/files/99029029488.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/30377533831.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611566f351730---60901928284.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/09b79517c854902c41b2c179ac6b3fb6/8189898249.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121cb1606f5---26056010554.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/lerosarutukivo.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/jafuvijepetunilawif.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///64694203499.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd8476535---45823132511.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qmjuh3bspd5ok0q43l6dc84dbi/12923796951.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210815_035841.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/77656862182.pdfIn PDF document text
    • http://ashioke.com/images/library/File/latidida.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec57f0b96---39031997196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hsk+level+2+book+pdf+free+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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17160 bytes
SHA-256: f66d781dacc102cd42b4610519f4748dce9aefd68faca147032d9488efc95049
font_01_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 10796 bytes
SHA-256: 73626c149d987fb18adfaa24f0968954bc674d71f9b3a39905b6b3d69994b9dc

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