Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d9a42adfa187e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 14:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48c2fc349ef9eaa031a6cdb4a3fb6d64 SHA-1: 7b95943fb7b36c44fa4429358de07b6cda8cc05b SHA-256: 4a0d9a42adfa187e2e2299402d0551028a96c7b6e88a0cd442ef32eff3b7b14f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these often serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2c0bt963t1gur2gapsou9r0psj/gabuxudeloru.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6293f08e99---bubefipadevenu.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/junebemisaxokosojerap.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/57224177897.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gobimok.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/77280677283.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/seserumevatuj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5df9fdc0---marelonusopeziwinesevuz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16094179cc2b85---kewuzedamubafowaliga.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/jogamerakozawa.pdfIn PDF document text
    • http://kaies.cn/upfiles/210730031124537756t4se2h.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621297597.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0ka73iievu9ea92mo1c47evpo8/nazifodereguw.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/45488666853.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/3355428322.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/73271000209.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wofugoburexijimogegowij.pdfIn PDF document text
    • http://contactconfiance.com/files/files/rutokexemasoni.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kexepepo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac6051355---91857129201.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/taxog.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vigoliluwapimevarel.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/dakebulomaxidarotab.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2f4ad0dc1db936991fece5bd42066f9d/66566918451.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/34bd3f5ded71235fc0e5e9aff1fa5948/jufuzenipedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=file+formats+similar+to+pdfPDF 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_off0000c7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 10532 bytes
SHA-256: 6e1dc3a5f5c5833ede7582fffc0a71e9d3d17af131d376bcec8d963de75d64a6
font_02_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 17560 bytes
SHA-256: 774b20295ebb958c4eef93d2e73d00655bbddb1965b7f2407b3bcb616367acbd

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