PDF malware analysis — malicious · 0820750aabfae752

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 10:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4c003e1742962f06a76c116e417011be SHA-1: dd614716925104c4bc8d3594fb7ac84a6543fabc SHA-256: 0820750aabfae752ad219f541f7e96c6683291d1c80f4754ec313d3453b3af25

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the document is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 7

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.
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://burchiellati.com/file_fck/file/29198071405.pdf In PDF document text
- https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2a39d36a62ae38c84962e766f5d0c2f5/72259538707.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/202163058529111.pdfIn PDF document text
- http://buddhavehicle.com/userfiles/file/46649981917.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/pewatejarexolowaw.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6ae4b593---jogitup.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/da6f1a4c833bfe0167bf6d159e51f412/pitimerigamebitizalizos.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e321cdd11699ce059a3b2e0e0bd8ffcf/61225191236.pdfIn PDF document text
- https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/jonabofafe.pdfIn PDF document text
- http://kappp.ru/js/ckfinder/userfiles/files/47195345893.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612937bfa8afb---waruluwugitotederapi.pdfIn PDF document text
- https://demetraproject.eu/ckfinder/userfiles/files/34601052318.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f3e63ceb---59201809331.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/n426p6sbbah2m11h4ckdd0c805/laxovopatopomarotel.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/81765690323.pdfIn PDF document text
- http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2860229515.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/22378381876.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/dodixuxatodovizazig.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708eb173cfe---doxukadafavojedoju.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5634254c---mazikulugetikagabiz.pdfIn PDF document text
- https://orderpoet.com/ckfinder/userfiles/files/97903189370.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c327c943269---jusulurabimujuxujuw.pdfIn PDF document text
- http://akvari-um.ru/userfiles/file/96089185723.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/6f49df407fb5e93cf43be5efcecc003f/zulameviletibufonisefos.pdfIn PDF document text
- https://elsa-daulte.com/ckfinder/userfiles/files/14445482978.pdfIn PDF document text
- http://osc-pribor.ru/products_pictures/file/11957633.pdfIn PDF document text
- http://hoclaixebinhthuan.com/upload/contentFile/file/57338651754.pdfIn PDF document text
- http://appletechsolutions.com/userfiles/file/86086126847.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=exstrophy+of+bladder+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFCD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f7e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7E4	10736 bytes
SHA-256: `869941378a9eadd7b5dabc54ec69f4ac09e5df224079be10565cbf0abaa0d1a0`
`font_02_sfnt_off00011089.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11089	17156 bytes
SHA-256: `bac160e5791b1ea58220729a6611f4caec9ea4f6823cf23964cd31238fea2f0e`

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