PDF malware analysis — malicious · 5e36d9a55fcfd4b3

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 02:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 2431f5398309b2a832df55e8299113a7 SHA-1: 5526bcabd6567b22af097a82e92be719c3ea6a87 SHA-256: 5e36d9a55fcfd4b3cd5e13bd76542acc38e41dafb1acef0bda978501a5b98f93

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote-support tool lure. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into downloading and executing further payloads, likely related to remote access.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Remote-support tool lure high SE_REMOTE_SUPPORT_LURE

Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
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://netcentricnj.com/ckfinder/userfiles/files/petixurixixupim.pdf In PDF document text
- http://phongkhamthienhoa.vn/images/files/kimixal.pdfIn PDF document text
- http://telegid.tv/userfiles/file/60440873114.pdfIn PDF document text
- http://z-sinpro.com/upload/files/31607039585.pdfIn PDF document text
- https://nbtele.com/en/cache/fck_files/file/93474553526.pdfIn PDF document text
- https://blogsma.com/files/4967169490.pdfIn PDF document text
- http://ipai-bg.eu/img/file/jufit.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/tikifukimumofi.pdfIn PDF document text
- https://booburger.myagenda.cz/pictures/editor/files/95559613674.pdfIn PDF document text
- http://bakineshr.az/ckfinder/userfiles/files/nuvufejebasodoxap.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/blcpc1g0t1nb011uo6ft656c13/posutorujoroj.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/45363919113.pdfIn PDF document text
- http://fge-service.com/userfiles/file/68458967217.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602fa28d87---96823769398.pdfIn PDF document text
- http://movitecnic.com/ressource/site-image/files/93042148897.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/rolatesafig.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/6732228523.pdfIn PDF document text
- https://davidfoleyinc.com/userfiles/file/22560831822.pdfIn PDF document text
- http://tentimesneedlehill.com/UPFILE/userfiles/files/23407487173.pdfIn PDF document text
- http://doradcyprawni.com/images/pliki/wagoxumulebifojojuxavis.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e78771f66---69123586527.pdfIn PDF document text
- http://mim2010.ru/userfiles/file/85832940640.pdfIn PDF document text
- https://thai-airpark.com/ckfinder/userfiles/files/2497995975.pdfIn PDF document text
- https://iringmalaysia.com/ckfinder/userfiles/files/zuxuvipusigolilomo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vnc+for+android+tvPDF 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_off0000d0c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0C0	10156 bytes
SHA-256: `529802b3f4dbc7257e05bdefa8570ba6169894ff45953070eda394e1c6a03439`
`font_01_sfnt_off0000e79a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE79A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ffac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFAC	18604 bytes
SHA-256: `01c184ba2a34222edafbfff1e8d7a10d6f0a481dac5c480802ed31bad582a780`

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