PDF malware analysis — malicious · 76d266d1646ac2df

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 14:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: c6508f0df690db200ddd170c8b316783 SHA-1: 90c33a1aad3106e150ecdb540be7785ee1ed0c58 SHA-256: 76d266d1646ac2dfae5701c5b08c5701ecbdd17b91509d89af4f81e01b0ac11a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, some hosted on compromised CMS platforms. The presence of many unknown URLs suggests a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 http://budgettranslation.hu/sites/default/files/file/dejetezuferup.pdf In PDF document text
- https://ozora.schaffsen.com/contents/file/dofajojar.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/gelagufiba.pdfIn PDF document text
- http://diagcorlifescience.com/attachment/file/fomikomakinufemuril.pdfIn PDF document text
- https://secolink.sk/userfiles/file/87027761081.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109030905031851.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/jajegi.pdfIn PDF document text
- https://excellencetogether.com/img/files/file/68094585715.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/03d49f87257a90df37c0957bf926b36a/71206206610.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6861727b---33058068232.pdfIn PDF document text
- https://campermagazine.tv/public/file/zirazu.pdfIn PDF document text
- http://women-for-marriage.com/ckfinder/userfiles/files/43728484780.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d28c96fee---satupipoju.pdfIn PDF document text
- https://fokusmedia.com/images/uploads/xajedazuset.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dacd9a2cfc641a48510b856b472625be/67117755571.pdfIn PDF document text
- https://myarchitect.es/ckfinder/userfiles/files/57017597320.pdfIn PDF document text
- http://nanobubblevietnam.com/uploads/userfiles/file/fupirugopafizejotud.pdfIn PDF document text
- https://hzautomatisering.nl/userfiles/file/rebiwurizamipum.pdfIn PDF document text
- http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/jaropesimuwuwugu.pdfIn PDF document text
- https://www.uflo.edu.ar/ckfinder/archivos/documentos/pokagemo.pdfIn PDF document text
- https://ngonluathan.vn/images/ckeditor/files/82630081154.pdfIn PDF document text
- http://ajk-opakowania.eu/upload/fck/file/90178953008.pdfIn PDF document text
- http://ovstav.cz/app/webroot/files/files/nelepekik.pdfIn PDF document text
- http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdfIn PDF document text
- http://analogsys.com/uploaded/file/38825820561324a15900cf.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=samba+server+pro+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d127.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD127	10444 bytes
SHA-256: `926f0007777bbc9fdcbeeb513f2ea17a450b9bed95c906e51ceda3d886ac5631`
`font_01_sfnt_off0000e8a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A8	16148 bytes
SHA-256: `1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78`
`font_02_sfnt_off0000fe34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE34	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011646.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11646	19640 bytes
SHA-256: `68ffc452d920a0954d1e2674587c4e8adf05291a1699f527ca6a7eab5fe8c8da`

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