Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1ba83f3045e50c…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 16:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc3ccb33f0cd8c899260ee07c6c8d190 SHA-1: 21958d535571c71303a5ae21272aa776cca5953d SHA-256: 7e1ba83f3045e50c4ccc344ee2dfb8cafa786a4d99b60382974bf67a0d178106
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The presence of multiple external links and the nature of the hosting suggest an attempt to distribute or obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://faprosid.com/file/xozuvop.pdf In PDF document text
    • https://all-stage-meditation.tw/uploads/files/60f8e63521eb7.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-28/20210628234438737464.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/21970328790.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/28221962005.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kizixo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4623805---kopigutabukuwotabojexa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/915bb480a1862b10aa1bd32f14125fec/zavut.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fb384850512d2d2170c612d3d9706ad6/zumoli.pdfIn PDF document text
    • http://dr-temt.ru/images/file/21902045368.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/nutipapi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95af43b4c---tenazu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vupogus.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a34cc62be---20470532832.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56809979196.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/zefukadiwitazosazu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b797ee96293---62012122726.pdfIn PDF document text
    • https://rm-parketi.si/uploads/69284259724.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/pavodukowirudodufivutiv.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/xudamotujolanizo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/64499295070.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gazolupuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=partes+y+funciones+del+microscopio+electronicoPDF 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_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10996 bytes
SHA-256: d18aafda6952cadf0f4c81c421f1c79922c84003c172258f83ff69ccd79bfc3c
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 18968 bytes
SHA-256: e6601cc139a99f7f748c43bc0322aba36c4516759a318ce3a40dd4e8d769938b
font_02_sfnt_off000142ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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