PDF malware analysis — malicious · e3652e4a72c0e950

MALICIOUS

PDF

122.3 KB Created: 2021-09-08 06:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3bc0329e82dadcf07c608da5d34a92f9 SHA-1: 8614536fa3c09caee1a0731d64ec11c5f5491e1b SHA-256: e3652e4a72c0e9504cb243b2843ef0ede235e7652c088a6b24b8e103a826180c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The file's structure and the presence of many links indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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://krisoc.ru/uplcv?utm_term=taxonomia+de+bloom+en+la+era+digital+pdf PDF link annotation
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160833bc90df88---buwutuzedovisuvu.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/20140389e943a7073027db3aef4d9a2f/4885589289.pdfIn PDF document text
- http://tv-sat.cz/userfiles/file/dugafevabasusopelefo.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3a0002a7515d19daee1d472623319282/lepolitako.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/4836424606.pdfIn PDF document text
- http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/megonovuvi.pdfIn PDF document text
- http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/likenulomu.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/67f14fd16c360f089f188cf40dcacaa1/dupibuzovejibabuzumodanom.pdfIn PDF document text
- https://vanvoorst.info/uploaded/file/25493188587.pdfIn PDF document text
- http://sushi-belovo.ru/files/81131155043.pdfIn PDF document text
- http://citra.cl/userfiles/file/rakotiduzupof.pdfIn PDF document text
- http://abwcolley.com/uploads/files/ledazujerob.pdfIn PDF document text
- https://pisangmanis.com/contents//files/57975154496.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/94456188925.pdfIn PDF document text
- https://palet-school.com/files/files/fovow.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac34787c6---muvabaka.pdfIn PDF document text
- http://pk.mo/userfiles/file/varunil.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8463ccd4c---3250784024.pdfIn PDF document text
- http://mtcongnghiepxanh.com/upload/fckimagesfile/juwitadajud.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/memozabifaponodokopazaz.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/20498527861.pdfIn PDF document text
- https://www.hosotte.com/ckfinder/userfiles/files/51053868630.pdfIn PDF document text
- https://mintowncoffee.net/uploads/images/files/potenazaxe.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0001a7b8.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1A7B8	17488 bytes
SHA-256: `6b37ccb50423966933c983d171ed420e917ec2986cb56fb4c9cf6a946576256e`
`font_00_sfnt_off00015a74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15A74	20440 bytes
SHA-256: `5ef37e8570ac22b06b5bebd4578d2d9a84a3700755fce0c5b9c9ba5689de26ad`
`font_01_sfnt_off00018fa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18FA7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001c208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C208	10880 bytes
SHA-256: `d0ea8299893a2b87124a5ba741f4c7752b0125539f815949fc9167cccf80d454`

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