PDF malware analysis — malicious · a85dd5cfec0f56c1

MALICIOUS

PDF

85.2 KB Created: 2021-07-09 14:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 9fce2ce982704b8091877f7932b9dea6 SHA-1: 2483dcc3b86da2fa2f2ff4469e69a521288c3b4f SHA-256: a85dd5cfec0f56c19f7c75c1773abd9868fd4f2ae224f322a874a55d7dc1c020

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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://pistant.ru/uplcv?utm_term=big+brother+angela+and+tyler PDF link annotation
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c947b163---gulizoxarufofibomefaluva.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8ae450fcf7e26a7570a72c1f27f2dc46/lakunijitiwezizokenenoje.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160cf94e1ef8d4---81536324288.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/043573c47f021f830c8a4e17178202be/sesebupidegij.pdfIn PDF document text
- http://efrex.cz/files/file/65700978838.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/tilomazujejefewevajitotut.pdfIn PDF document text
- https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/898207c38d4478aa153530af8c320ef1/35606472745.pdfIn PDF document text
- http://coiffurenais.com/userfiles/file/14783044482.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a9980ecad---42646920119.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c57580e4c65---91642723063.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kbvcas3jru47dfcln2vt7sd7ko/dofix.pdfIn PDF document text
- http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/42997213791.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081756eccd4f---robazapupuxubumutu.pdfIn PDF document text
- http://ilyxrace.com/userfiles/files/34603422774.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73213085f---94636838391.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160996c334e47e---14232870199.pdfIn PDF document text
- https://clickkedai.com/userfiles/file/gasabobagulunuf.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad5bb47dd---feganuwizagesabefisiku.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqs5qfk4dlb3j61etr7cjlg7h9/60151288625.pdfIn PDF document text
- http://pwr-tech.ru/userfiles/file/tigoratu.pdfIn PDF document text
- https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/97525025775.pdfIn PDF document text
- http://misspacificus.com/clients/873634/File/80237546103.pdfIn PDF document text
- http://dentherapia.hu/files/file/gedejatulek.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be26c73ea61---62745089058.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_off0000eb37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB37	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010349.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10349	17216 bytes
SHA-256: `e867ccc3f3a127481365ac46456acd7383a657334f8eb2011c52d9bfda10d6ca`
`font_02_sfnt_off0001309c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1309C	10668 bytes
SHA-256: `9e9d61a02c408e6a3d78bb39f5d03dfa3b7edb4d92025d725d0976fbc614808e`

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