PDF malware analysis — malicious · da77f80fa98de7ba

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 2037d0623ac56b45bd4803315c58c354 SHA-1: a43d8b84d538a1f5c6672e53d05c400d5ddcd302 SHA-256: da77f80fa98de7ba306835d7647832f358db64fa882c97a4b9eef7d3416303bb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=heroes+vs+zombies+mod+apk PDF link annotation
- http://personnelstrategies.net/userfiles/file/69505274863.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/67787562341.pdfIn PDF document text
- http://jamesandsons.ca/userfiles/file/susabiwezikakisogatori.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/birasorilozematexikopara.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a0398ac2---vexexapiku.pdfIn PDF document text
- https://sintasyapi.com/img/userfiles/file/nisoloduv.pdfIn PDF document text
- https://nhabe.com.vn/ckfinder/userfiles/files/vezowakitifotigoxabol.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/36646767928.pdfIn PDF document text
- https://srinivasagroup.com/ci/userfiles/files/kujavijisanelu.pdfIn PDF document text
- http://lsneotek.com/ckupload/files/zewavaga.pdfIn PDF document text
- http://shiinamotors.com/js/upload/files/33029411209.pdfIn PDF document text
- http://frigotechreina.com/userfiles/files/30982659466.pdfIn PDF document text
- http://seto.cz/uploads/97352086105.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06fe0aa00---1684094412.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qfq3smefpca3v8obqrq3s835k2/42662569912.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/a7u35rgavati44j75o77kq8am7/vezikuta.pdfIn PDF document text
- http://puebloexec.com/userfiles/file/49359888132.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fcc75787a---32824459782.pdfIn PDF document text
- http://audidalys.lt/ckfinder/userfiles/files/tofuguwori.pdfIn PDF document text
- http://gelateriacool.it/userfiles/files/39018275085.pdfIn PDF document text
- https://safetyhanoi.baohohoanglong.com/userfiles/file/paduzeboxalofez.pdfIn PDF document text
- https://alicantea.centralcms.cloud/galeria/files/palowogejikiwafal.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/giwizubaselazokogewuxobaw.pdfIn PDF document text
- http://kelsenator.com/userimages/9033917950.pdfIn PDF document text
- http://vodova51-53.cz/files/41491591162.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_off0000b653.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB653	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ce6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE6A	10656 bytes
SHA-256: `9735f57154c92f1533c2ee16234820d92a3ec226a042d9889d49896d4e92b98c`
`font_02_sfnt_off0000e69e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE69E	17224 bytes
SHA-256: `cb64d4b3059db145b78bf9111fbcc62174a0732b51796994374a5bad74c15be8`

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