Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23297f15b8736e4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 14:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd7978b9bdb1d3ac2f2a453c6e2d1dce SHA-1: ad028fdfbbd1b6aebcf43d3557625c1d4dbfc778 SHA-256: c23297f15b8736e4fd140db4966566689a7cf9da1d17ea5d1f31eb53072ad9e1
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8cb1c87f---4045477566.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/towosowivejepipesi.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/xavorakavezafetumidorozer.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/58603671246.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4d62dabef4e376bfe21a3c4c34731371/vukigopovujerubiwim.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/fezitexojin.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/75177627060.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/gozivagufewaxakaxe.pdfIn PDF document text
    • http://specimport.by/files/files/dapetiwalut.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386c5b714ae---sebufisam.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ka3oicvkl8r7jr1jf85ocbthhh/63226142283.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/tejujinemuxavevudop.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/77880734170.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109040307312031.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/34527703600.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/90942852634.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/41463627860.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/satimojolun.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gefapedawote.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20280713987.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6bb0d03197d04c0b05e6f38dbada4ced/91082132796.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xamox.pdfIn PDF document text
    • http://orem.mn/uploads/files/67795579789.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/57151654767.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zatikapitutugidizogijesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dinosaur+hunter+deadly+shoresPDF 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 19628 bytes
SHA-256: e66b124939fd472eefe00fabf55a06b22480df41a3c844eb11bf984b4974f804
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 10560 bytes
SHA-256: 18bd0b8de898955c7a5530916590500fc67ab5c8b934e7fb11b38c8674175be0
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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