PDF malware analysis — malicious · c53eff3a748dd685

MALICIOUS

PDF

84.0 KB Created: 2021-06-15 22:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 2914261878c0ee6409018a26626a557c SHA-1: ff79a6ccd960f4841cd9585d94fa9847cb4835a5 SHA-256: c53eff3a748dd68508070e5bec59740c00e779b01e00aa95d847ef6559446967

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a link farm designed to obscure the final destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=publisher+logo+design PDF link annotation
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5hju0ihaqfgfqt7utm5m5isqu3/vimajagezodavunopomomin.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf610f98f---31498464167.pdfIn PDF document text
- https://cissud.eu/uploads/ck_editor/files/zarufiritenikix.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/805f8a25ffb2b9dddbc11794fd301c28/32000565084.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0f872bd245fb4c11b8979b17d64f54de/dumalenaxawuxufe.pdfIn PDF document text
- https://mps-india.com/userfiles/files/dawinewuzenu.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02695e53c---tanefapudozakesetoretirer.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gq92u8nrolh2c9tpb4k1okgsj8/16419705309.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fc29d623---wirilomiteloferadetodufa.pdfIn PDF document text
- http://self119.net/upload/userfiles/2021/06/files/210606125834.pdfIn PDF document text
- http://minutemen-jrotc.com/clients/84940/File/fawaxepezuzojivarirafugi.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1c0c4d566cee79d40f89505783e7c3b2/11812194716.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856e683baa3---8584902892.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/37857a2d99c8bc42244631f0071317ea/segaraxunatadup.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbsqtq9dda2qf8l1va0g2l9jrj/72110302416.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93b992ef376a7fb3cfb08c5de60aa360/negonawokelos.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd053df023---sixiku.pdfIn PDF document text
- https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/feacd024d4430e69798f48dc32bc3172/81685653732.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001039f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1039F	5016 bytes
SHA-256: `fef1dd15e74da838bc5069e4a4f8757ff128b85520671a624e136d8ef976ec3e`
`font_01_sfnt_off00011496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11496	1800 bytes
SHA-256: `51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0`
`font_02_sfnt_off00011d24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D24	10936 bytes
SHA-256: `668c9450b4bc1cb42d9be8b518c016ee42d5861728cb333922aa89603d4d279b`

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