PDF malware analysis — malicious · b52848c42ec155a8

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 07:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 7ea3115f58aabd41ad9a2d1e547c38f1 SHA-1: d252facc10c6db7a13296d8a9f855481db819744 SHA-256: b52848c42ec155a86eacdf84b0935df4543813e884364d1d90dd80f4b2421c42

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious redirects or download further payloads. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, strongly suggests a link farm designed to obscure the ultimate destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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
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://crewmak.ru/uplcv?utm_term=dvd+to+mp4+converter+free+download PDF link annotation
- http://tainanrup.longi.tw/uploadfiles/files/20210923_121455_4645.pdfIn PDF document text
- https://himalayanwanderer.com/himalayan/userfiles/files/sonoxorefikilamijuvavib.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130edc44d848---34376805021.pdfIn PDF document text
- http://funkyspa.net/ckfinder/userfiles/files/sejowofamesokotukef.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/68591012936.pdfIn PDF document text
- http://ayurveda-shiatsu-qigong-nice.com/upload/files/48210626481.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0881d9dd7---83735370994.pdfIn PDF document text
- https://gospel-streams.com/asset/ckfinder/userfiles/files/69964647384.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/magujuwipo.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999234ca6d---396489366.pdfIn PDF document text
- http://floramarble.com/uploads/86565965915.pdfIn PDF document text
- https://mtestbd.com/assets/uploads/files/zigofaluxop.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/11c861637f48b8df3b3f078a956a22cf/denododuton.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/89220208668.pdfIn PDF document text
- https://ecowaytechnologies.com/ckfinder/userfiles/files/gijavanuxupufekewurizo.pdfIn PDF document text
- https://ibericadearmerias.com/file/darebagitanulitejagesuvaz.pdfIn PDF document text
- http://deborahkay.com/ckfinder/userfiles/files/83928947067.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/tomebelabetowe.pdfIn PDF document text
- https://indiachristian.org/uploads/files/52225933762.pdfIn PDF document text
- https://dtd.com.pk/ckfinder/userfiles/files/11279184527.pdfIn PDF document text
- http://acrclubinversores.com/files/galeria/files/71762373108.pdfIn PDF document text
- https://www.uflo.edu.ar/ckfinder/archivos/documentos/9107892264.pdfIn PDF document text
- http://njchemland.com/upload/files/33832290498.pdfIn PDF document text
- http://landonintergroup.com/ckfinder/userfiles/files/91312111613.pdfIn PDF document text
- http://jubangh.com/Upload/FckUpload/20210923file///dimuwutag.pdfIn PDF document text
- http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/54905290685.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_off0000d95a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD95A	10752 bytes
SHA-256: `a450ac50cc3e3c4076bca70f529aa6504c78dcf42be6f82a42f377016b476e61`
`font_01_sfnt_off0000f22a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22A	17988 bytes
SHA-256: `9cf64112bb42898e7f03fa6d4e4d1890cd3832feb3153e8c6c1158b8f76ca2e0`
`font_02_sfnt_off00012046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12046	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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