PDF malware analysis — malicious · b9199f6553380b03

MALICIOUS

PDF

70.8 KB Created: 2021-09-08 13:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: da642db52491a982dc2d199b41aa86f8 SHA-1: a17c5fb582b3d04290c1b4d7aba5d5524f2b42dc SHA-256: b9199f6553380b03c2b57003279693bf455601df8360af6adb5cdfc35fa38013

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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 https://cructi.ru/uplcv?utm_term=translate+chinese+pdf+to+english+free+online PDF link annotation
- http://kiko168.com/UploadFile/file/20210906000316506.pdfIn PDF document text
- http://mitroc.com/userfiles/file/misemupolajo.pdfIn PDF document text
- http://bahtiyardishekimi.com/fckfiles/file/36760508794.pdfIn PDF document text
- https://marblo.com/app/webroot/img/files/dotenimof.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc30c092d---45598600543.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/tuvirefil.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357fa76a16---jatudowevolepijobulot.pdfIn PDF document text
- https://billionbosses.com/ckfinder/userfiles/files/padubudixawenoloxerug.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/xuzigidovixa.pdfIn PDF document text
- http://eva.am/files/4deeacb45caa37e0.pdfIn PDF document text
- http://propertiesforrent.com/userfiles/file///bamagemoru.pdfIn PDF document text
- http://idominjazz.com/fckeditor/userfiles/image/47239514884.pdfIn PDF document text
- http://hasomedia.com/userfiles/file/9300784106.pdfIn PDF document text
- https://quangcaowebsite.xemlaco.com/uploads/files/35078003320.pdfIn PDF document text
- http://nomayaku.com/userfiles/file/88143262324.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161367ff0d2c2c---36138264635.pdfIn PDF document text
- https://bestcaps99.com/ckfinder/userfiles/files/zunezajorefamatibo.pdfIn PDF document text
- http://yourmoneyyourbank.com/uploads/File/98119132506.pdfIn PDF document text
- http://mstreatmentadvances.com/userfiles/files/797528169.pdfIn PDF document text
- http://lauraestetica.com/userfiles/files/sokuvotowiragenojifafuze.pdfIn PDF document text
- https://npkfertilizerproduction.com/d/files/9266716017.pdfIn PDF document text
- https://beautydiction.com/ckfinder/userfiles/files/gixaget.pdfIn PDF document text
- http://cafesezony.ru/fck_editor_files/files/sepidodubal.pdfIn PDF document text
- https://tnmkor.com/FileData/ckfinder/files/20210907_A9F9E751BDE7EE36.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138601c1e476---xelotaxolulaje.pdfIn PDF document text
- http://www.pvvc.cz/files/3496711678.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_off0000b49e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB49E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ccb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCB5	10864 bytes
SHA-256: `025e518b5c3a86018431109804f048839d1ba9f146b545e8015d9a06353ef2ff`
`font_02_sfnt_off0000e57c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE57C	15724 bytes
SHA-256: `55f1f0f3bdb8544830b546785975cf9f0bdbcb3fd9312533d0811f3967d21edf`

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