PDF malware analysis — malicious · 3655e44b5de80992

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 591cc46ea9bfdb4dd92808e269d0d841 SHA-1: de7c228311ffa3c5c64a3a30703498835334f1e7 SHA-256: 3655e44b5de80992d0cc8a165e0c4e48361d4a905d406a36681f974393031434

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=o+sistema+do+android+parou PDF link annotation
- https://fcksa.com/ckfinder/userfiles/files/fuxezipegosewupolibe.pdfIn PDF document text
- http://studiozammuner.eu/userfiles/files/74983935995.pdfIn PDF document text
- http://stfurnimart.com/file_media/file_image/file/vabutozafinododi.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3094a9c2---dubumu.pdfIn PDF document text
- https://uleshuzatabc.hu/files/file/41456989425.pdfIn PDF document text
- https://tommytest.dish1314.com/data/html_editor/files/nererenuzabimotufuniju.pdfIn PDF document text
- http://connect-event.fr/ckfinder/userfiles/files/rokusi.pdfIn PDF document text
- https://brawlcall.jordanadams.com/ckfinder/userfiles/files/44913889189.pdfIn PDF document text
- https://venus-forever.com/image/files/24120416116.pdfIn PDF document text
- https://clic-essc.ch/ck/ckfinder/userfiles/files/gowubizuripewatexe.pdfIn PDF document text
- https://sistemagestiondpr.co/userfiles/file/49874899074.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bddea4fdf3---govebamamukisefas.pdfIn PDF document text
- http://gfzgt.ch/upload/file/73491483979.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b5e1c28ff404750158dd22bd0cc78982/1393116649.pdfIn PDF document text
- https://www.kindspring.org/inc/ckfinder/userfiles/files/zusefimuvit.pdfIn PDF document text
- http://bright-mineral.com/uploadfile/file/2021091123000318.pdfIn PDF document text
- http://flex-link.cn/uploadfiles/files/48895419316.pdfIn PDF document text
- https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/jaxukowix.pdfIn PDF document text
- http://peter-crooks.com/userfiles/file/3448233392.pdfIn PDF document text
- http://amidoux-peintures.com/ckfinder/userfiles/files/73846307725.pdfIn PDF document text
- https://satbietthu.com/luutru/files/65231871591.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5bkj0vb0ef0onia95iaerrn85s/mupus.pdfIn PDF document text
- https://makiriaszto.hu/ckfinder/userfiles/files/37756823967.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459e319f1d1---48752459844.pdfIn PDF document text
- http://tmkb.org.tr/ckfinder/userfiles/files/ruwes.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_off0000d8e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E7	10632 bytes
SHA-256: `6f8b9eaeff134dd335d306bd23fb262ac89bcf8c92f0a63722b4a0711cb6f659`
`font_01_sfnt_off0000f138.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF138	20428 bytes
SHA-256: `541af022b5a79f751599c69b3bad6dc7c114e3774752e47ec819663b8390e897`
`font_02_sfnt_off0001242d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.