PDF malware analysis — malicious · c53fddf1b61cd88a

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 15:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6180f4755f09c4b1a45424973340bc92 SHA-1: f41da5e6609eae7aef41b492ba35b7455d7b5295 SHA-256: c53fddf1b61cd88af9692489eb552d99985bc4e08fd4fcf99c32e8c6230dc836

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7bbeba9---fuxijulelikogegug.pdf In PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/43e295a18a16ba563b93137a0a8bcf18/11734669952.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a9ead8480ba39bf7aeba6cf3bb2da44c/28418546239.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/54ae65f9df61e12ba5c813d9723b41d2/famivaguduzekosolevena.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3afe425f5208e8599a738e8ebac31748/nivokawu.pdfIn PDF document text
- https://fullgame.hu/uploads/files/49803336554.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed81e4d4e---84487377791.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4428e5721---69008320582.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907f65bb54b---42010058455.pdfIn PDF document text
- https://peptidturkiye.com/ckfinder/userfiles/files/87688006073.pdfIn PDF document text
- http://dzbnf.com/upload/file///61446982642.pdfIn PDF document text
- http://1night2daytour.com/ckupload/files/rorojazebub.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0c5111d4---fafujanizafinepilorix.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/792f4970cc901a478d9a3493d1950f05/53844630992.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f98c0f1c---zofisag.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160948160408b9---momizamikaselisuziwik.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0404261d28---vuvotogixafumilib.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/64faa5139c395165ee2cf1a688de1e4a/90869091635.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5db175252---6951996232.pdfIn PDF document text
- http://oreade-breche.fr/userfiles/file/gupedorogaxuged.pdfIn PDF document text
- http://zegabilisim.com/calisma2/files/uploads/wugasopexinegilu.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lf63cd0ha5f6pmlbfesevbdm56/18911467106.pdfIn PDF document text
- https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/sennntdsc31ojnlq1l4v2ohg8f/jufanivotivutelupov.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021062518465173499.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/13882ea035ec57deca2352eccef81180/livujuzu.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/zufimu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+child+support+taxedPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f074.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF074	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010886.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10886	17492 bytes
SHA-256: `8eb951c439f2860ff143846f0aa1f05bd096a73d87890de0cf95e53b5f2b30b6`
`font_02_sfnt_off00013651.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13651	10660 bytes
SHA-256: `e8abd73e493cce86d53ecbaa5e7a264df0f57f348777faf087307f9628682b8b`

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