PDF malware analysis — malicious · 417b6cb2aa48bfdd

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 07:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e233d727ed0672fc85a07ca1b562de3a SHA-1: 6750a33a40e6a6dc04b6e4c5f19fe0f4116c61cb SHA-256: 417b6cb2aa48bfdd3bc2c9dde53be36cd6ffb1b0879ab8224e2dc5cd30821bb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://bora.su/ckfinder/userfiles/files/gekusanemizi.pdf In PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3890f3a28a---23721089636.pdfIn PDF document text
- https://standsimulator.com/ckfinder/userfiles/files/diriziguwapumaratopazokad.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0cf81e31b---xeredu.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d565e6c814---daganexatigamisokokifamo.pdfIn PDF document text
- http://maiodi.com/userfiles/files/10407909336.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a207754ea75---zetige.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609615d14adb4---11628367938.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/zabavukuxewidabukejomek.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f2eb1a4d---jofapugozubixaxurom.pdfIn PDF document text
- https://keongracun.org/contents//files/55394242363.pdfIn PDF document text
- http://zhongguohuachun.com/d/files/gipukuri.pdfIn PDF document text
- http://gancza.pl/userfiles/file/59145626768.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b2ca6828554763e2ab064e6a580c4b92/kusegejeno.pdfIn PDF document text
- http://www.ags-sib.ru/ckfinder/userfiles/files/93106394777.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/33649591995.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b686b0be50---bizerotobo.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610877fbd8f17---sodixinenunulapiroz.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/63272703604.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59da38d92---vefuzuvaxajikibi.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b63a76356---53782485341.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nni68qic1g5t7nl6q57d07qu29/demixajunisetedewifupe.pdfIn PDF document text
- https://directorvincentchow.com/fck_filemanager_upload/file/71789457717.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/69a2c68a9a27d91955e0c1a48ffa66b7/matozufobopebaroxeworuxes.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2e4a8dec---lumokixusejudejimedetos.pdfIn PDF document text
- http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/vaseladupodibegon.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=proximity+sensor+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cbe9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBE9	17420 bytes
SHA-256: `50edea72c3a7c20dd2b23679bc375123f84ad17415e3627cf1c753778b019b73`
`font_01_sfnt_off0000f8e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000110f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110F8	10960 bytes
SHA-256: `738ec7d02a19a5fe688c5faa467347e7604a4de4df9dbc4133298a006e2dc920`

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