PDF malware analysis — malicious · b0df631611b6ef48

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 56a0595e2e815d8fdc59a2eb30dfbb55 SHA-1: 6df62d02d78fc51e0580ce074c0f092bc763ade3 SHA-256: b0df631611b6ef4887fece09bb62ec7fc0147a2275df5f9ad63cf39fe7a59106

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=android+tv+cast+receiver PDF link annotation
- https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/62075589938.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c05ec2226---83570135337.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9d1910e0---dudizazen.pdfIn PDF document text
- http://fsgzb.com/upfolder/e/files/20210912042010.pdfIn PDF document text
- https://grandiosieventinuziali.it/filesUploads/file/najokamolarixale.pdfIn PDF document text
- http://imosa.asia/uploads/files/202109130521432989.pdfIn PDF document text
- https://ascii.tn/web/cgi/file/39948014997.pdfIn PDF document text
- http://vaonhaphatphap.com/images/uploads/files/gogifukufagina.pdfIn PDF document text
- http://geoodwierty.pl/files/file/pedemepipe.pdfIn PDF document text
- http://dralituncer.net/userfiles/file/kixunupidazipipe.pdfIn PDF document text
- https://olboihorgaszto.hu/editor_up2/vekesobunogiwuvoguri.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed83814a2c---9774382051.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/67164362954.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/gedubudaxogepenulisobiker.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8a7b32d7---8479991174.pdfIn PDF document text
- http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/27611503885.pdfIn PDF document text
- http://nextlab-semi.com/files/fckeditor/file/6322381955.pdfIn PDF document text
- http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/56359198369.pdfIn PDF document text
- http://www.hkrns.org.hk/ckfinder/userfiles/files/99084492819.pdfIn PDF document text
- http://marleenjansen.nl/images/uploadfiles/dipemunepinafibugi.pdfIn PDF document text
- http://stoewebdesign.no/userfiles/file/76268789114.pdfIn PDF document text
- http://savages.lu/imagesRTE/files/mivamomab.pdfIn PDF document text
- http://videotour24.com/data/fckupload/file/nazirinobupibejedatoga.pdfIn PDF document text
- https://institut-arabe.org/ckfinder/userfiles/files/94859204457.pdfIn PDF document text
- 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_off0000e063.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE063	18624 bytes
SHA-256: `684618a273dc6cf848136dc2c7bfa5b1d410b8c78572e47fcd8b6b85759a6509`
`font_01_sfnt_off0001109b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1109B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128B2	10364 bytes
SHA-256: `02e33305d7579427951099ff52d9a8c7f5fe86a5f73474f047854e03236ead67`

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