PDF malware analysis — malicious · 197f45db9260b93a

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 12:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 73fcb64b9a12b78926a4a07cb67a28ae SHA-1: 96468cdbc6a8972488a7cac8e29bb34370feab43 SHA-256: 197f45db9260b93a0295b73a3ab143d351626ff573c13d65a18ee92fcdd78311

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://aiaciran.org/cache/fck_files/file/konafukatufiselaxufo.pdf In PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2c3b1e9755e7bf722ae33c3f8bb2c7a8/zevafajajakuduzuwufapex.pdfIn PDF document text
- http://vector-food.com/userfiles/file/53066528343.pdfIn PDF document text
- http://turhantur.com/turhantur/files/26758308577.pdfIn PDF document text
- http://dralituncer.com/userfiles/file/49710331092.pdfIn PDF document text
- http://robalton.es/Albums/images/file///muzimokenoxupexoxumolove.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273e48e06---48706396257.pdfIn PDF document text
- http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/sudikodugeduvinatomuzepez.pdfIn PDF document text
- https://bitree.com/ckfinder/userfiles/files/zowenoboraduvumuzujukemiw.pdfIn PDF document text
- http://centrons.com/uploaded/file/12589641056135c4605740c.pdfIn PDF document text
- http://naturpix.ch/cmsimages/file/mazutozakejazugadikigor.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/23564252921.pdfIn PDF document text
- http://camel-republic.com/media/userfiles/files/25481068131.pdfIn PDF document text
- http://digitalpolicycouncil.org/imagenes/file/gupudoxitenuvogobi.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343239cb5e2---rutokokedazi.pdfIn PDF document text
- http://gysanya.com/upload/file/210906084456998651dauf06a4yzg2.pdfIn PDF document text
- http://ruben.pl/ckfinder/userfiles/files/9210468930.pdfIn PDF document text
- https://quangcaomattroi.com/uploads/news_file/91398772538.pdfIn PDF document text
- https://funbugs.ie/files/file/12913831063.pdfIn PDF document text
- http://gamax-moto.cz/data/dokumenty/98785117241.pdfIn PDF document text
- https://mgc.to/sites/web/upload/files/11403860713.pdfIn PDF document text
- http://tatishev.ru/admin/ckfinder/userfiles/files/gobijokiwoxutusi.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/29770668471.pdfIn PDF document text
- http://portalcom-b2b.es/img/user//file/_0872346001631137591.pdfIn PDF document text
- https://castilloexterior.org/ckfinder/userfiles/files/84178617106.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grand+theft+auto+san+andreas+free+pcPDF 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_off0000c911.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC911	17340 bytes
SHA-256: `7ec428094eb45d100e8091648b352b0e10769bd5eea8d7d53461ed281271397e`
`font_01_sfnt_off0000f5fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5FA	10720 bytes
SHA-256: `d0beff152633dd5a6d9949c34bcecaf55dbaf44646672db610b45cec5ee92a2f`
`font_02_sfnt_off00010e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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