PDF malware analysis — malicious · 0400939b8616024e

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 23:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5ecd2600b8ed453526fd291eb1922501 SHA-1: d4a551cf213c2dd7edcf7a471345c9679ac9bcb5 SHA-256: 0400939b8616024e9854c35a6ea992e4bd38663d171ea52d4937e1dff6cdda87

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This suggests a tactic of SEO poisoning or a phishing campaign where users are lured to click on links that may lead to further malicious content or exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

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.
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://dailyhondaotomientay.com/upload/files/34457490608.pdf In PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/16749044589.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10c5b1db04c1c04e2d64b75b355dd73d/36363649475.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/kafomupidegog.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/483d2378473584fdfecc38ef535b1388/66841730606.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fa011bb5---jukagisakuwajoxonoxufa.pdfIn PDF document text
- http://chothuexeninhbinh.net/data/dulieu/files/16060806227.pdfIn PDF document text
- https://mk-promotions.com/ckfinder/userfiles/files/vegojinen.pdfIn PDF document text
- https://taiwancy.com/app/webroot/userfiles/files/93906847368.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46c160b1bee4374e6fa5637b42727e5e/putokave.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6811511c2918991423d88f0602ecf80f/mexeximulesivax.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a45bc4efc---tafavexuleluga.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cb6ae4e32334eafa7b6c804576c85826/suruxepizomi.pdfIn PDF document text
- http://acecaalcoy.com/userfiles/file/89930907073.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608153bf8d55a---46931861385.pdfIn PDF document text
- https://zhongzing.com/uploads/files/202108170930162952.pdfIn PDF document text
- http://reanda.com/jingkelun/userfiles/files/20210605194700.pdfIn PDF document text
- https://pastelbuilders.com/userfiles/file/5424914715.pdfIn PDF document text
- http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/8589319336.pdfIn PDF document text
- http://suliaok.com/v15/Upload/file/20218152053552876.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609380504c54b---mifoxoxive.pdfIn PDF document text
- https://arerp.kr/data/file///14048065345.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ulgk80vos58b1stlro4gkhhv96/45666508842.pdfIn PDF document text
- http://hoangminhceramics.com/app/webroot/uploads/files/xuzudulisaxu.pdfIn PDF document text
- http://tamker.hu/userfiles/file/7982140208.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a454c00f538ba1108607b057f6454607/13717255736.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=early+islamic+architecture+pdfPDF 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_off0000c9e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e1fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1FE	10860 bytes
SHA-256: `2ac244fbef39385e473ce17ffe54935aac1feb80ab76d6354ba1f24971b1fce3`
`font_02_sfnt_off0000fb12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB12	18512 bytes
SHA-256: `24c37920575a60a7a6d29a4ad7d3f3a548d00ce54b574ad6c89ed99af4f069c9`

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