PDF malware analysis — malicious · 6a6ec54ed09865e7

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 20:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 7b8c2b0c301c5f10980e4559cbb8ca06 SHA-1: fd5908188d322e31e532914a666165ee15d0a7b1 SHA-256: 6a6ec54ed09865e78e5515b5c928b309e6ed00b7ed94ec3b4a2ca1935c84a0da

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. One prominent link, disguised as a Windows 7 download, likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://hzdsbg.com/uploadfile/1631168502.pdf In PDF document text
- https://noursportevents.com/wheelmarine/userfiles/file/rosebilebox.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/nuruxonedasovum.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1bbeb1b1e517ea6f4449b779b25e0288/76501125120.pdfIn PDF document text
- https://longhoang.vn/upload/files/zuxudetilevudaxunukovu.pdfIn PDF document text
- http://notar-frings.de/userfiles/file/fopenoraxu.pdfIn PDF document text
- https://srilangkapools.com/contents/files/18749999051.pdfIn PDF document text
- http://maekalocal.com/Maeka/UserFiles/File/83797669405.pdfIn PDF document text
- http://chenruichem.com/upload/files/67340616711.pdfIn PDF document text
- http://cnsgafgl.netsociality.com/upload/files/98680195322.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b259027565---78454339720.pdfIn PDF document text
- https://mma-montessori.com/admin/ckfinder/userfiles/files/40240971604.pdfIn PDF document text
- http://aumnat2car.com/ckfinder/core/connector/php/upload/files/58031936409.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/gogologunewizasitesemu.pdfIn PDF document text
- https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kabunowidagonovut.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ab0925f---boxukirurim.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/79eb2110dc5166a4cda688ed9aa999f0/71925131852.pdfIn PDF document text
- http://orthodoxnews.us/file/mimekonidisubefimawuwojal.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/baxegisugajo.pdfIn PDF document text
- http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufakid.pdfIn PDF document text
- http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/79804350544.pdfIn PDF document text
- http://saveursetsavoirs.fr/image/file/mulumolirumofegokiloleno.pdfIn PDF document text
- https://cornwallstaffagency.com/userfiles/file/44037570882.pdfIn PDF document text
- https://invision.buzyhub.com/files/nulos.pdfIn PDF document text
- http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/3741406922.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aba35a604---23349312755.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+7+home+premium+x64+downloadPDF 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_off0000def3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f705.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF705	17436 bytes
SHA-256: `10109c7c112a3ebd31be60b61b546df3ccdd417245841f74394a06504f597800`
`font_02_sfnt_off00012430.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12430	11136 bytes
SHA-256: `d28b2f23b184cb236060357486fb5143ca7f05f3fe1a7b867b51b626e41c7489`

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