PDF malware analysis — malicious · 5882fdd3270599c0

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 18:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 11c49d4a8d5493c453fdcf98c4f5e8d8 SHA-1: 6b4f2ce7e9a5a6f3887154c3948a8a24dd576da7 SHA-256: 5882fdd3270599c0c16262396337580cc79e6423f11367a6baef3e0c638f1837

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, with several pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://konferencii.org/web/uploads/assets/file/20807631303.pdf In PDF document text
- http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/85974748946.pdfIn PDF document text
- http://abwwilson.com/uploads/files/sovajozaxakelawamigol.pdfIn PDF document text
- https://villadorottya.hu/uploads/frontend/files/5387999044.pdfIn PDF document text
- https://keyseries.us/userfiles/file/mumudam.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cac25137b---67251031886.pdfIn PDF document text
- http://american-security-inc.com/assets/ckfinder/userfiles/files/lemupurakeletuxajito.pdfIn PDF document text
- http://clinicaveterinariacene.com/userfiles/files/46601082965.pdfIn PDF document text
- http://greddy.com/admin/common/ckfinder/userfiles/File/71516811200.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b12ecead72428db92e2e75fc5c8b65ca/nofagura.pdfIn PDF document text
- http://zonazero.es/userfiles/file/mejorelikinupakinomufafo.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c7eed14---55814729061.pdfIn PDF document text
- https://denizlihorozu.com/resimler/files/jemogawusunuruxarekekira.pdfIn PDF document text
- http://siblom.ru/files/upload/file/58989399105.pdfIn PDF document text
- https://moraure.net/js/ckfinder/userfiles/files/kepijifariguk.pdfIn PDF document text
- https://apaman.ti-am.jp/js/ckfinder/userfiles/files/74325464151.pdfIn PDF document text
- http://lungshingcentre.com/userfiles/xibijafefukekukurazu.pdfIn PDF document text
- https://currenwatch.myhost360.cn/file/upload/files/09-06-23-53-18-26.pdfIn PDF document text
- http://ingegneriarossi.it/userfiles/files/79203410791.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210904065648283.pdfIn PDF document text
- https://alharithiforcameras.com/ckfinder/userfiles/files/85121686431.pdfIn PDF document text
- https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/loziji.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139788ec90d5---kemewituzarejobevawakex.pdfIn PDF document text
- https://laser123.com/geektic/files/soxonajazu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=onenote+2016+androidPDF 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_off0000ea68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA68	19960 bytes
SHA-256: `5522a6969131e63e42cb32324d2132d6605752d3be4569a11ace57fc573b0ec6`
`font_01_sfnt_off00011f69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F69	10512 bytes
SHA-256: `06677707b13d527904644f14a0943a4e6f0e1060d8277609468e876ad352e8df`
`font_02_sfnt_off0001378e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1378E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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