PDF malware analysis — malicious · 272a6cdbcfe3eca7

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 20:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e43dad94e69cf27a89f7e8baca422512 SHA-1: 3dc97193834c0a935619aee0aee0907a4b696156 SHA-256: 272a6cdbcfe3eca78898c17b18b3dc8f4150dcd32be8ee8459e2f839cb5ea377

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=worksheet+to+be+present PDF link annotation
- https://lanhcongnghiepthinhphat.com/upload/files/94372762574.pdfIn PDF document text
- https://www.thaiahpa.com/flash/files/30635235127.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/7697767996.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/733e2a95bb05c5e4bb7270847706ee0c/81838621670.pdfIn PDF document text
- http://moutierrozeille.fr/userfiles/file/11285472486.pdfIn PDF document text
- https://stillwaiting.org/userfiles/file/pirixuvitomememurefivudod.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/71b413354d314ae97f7037f0cdc3e1e5/reloronorimir.pdfIn PDF document text
- http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/18619441050.pdfIn PDF document text
- https://ribaczpeter.hu/files/file/9230717089.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0716925892---92242594932.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f59947c77---kokuvimor.pdfIn PDF document text
- http://jungam21.com/upfiles/file/1629359972.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769b128e0ac---kusanuxir.pdfIn PDF document text
- http://lactopad.com/uploads/files/71442776662.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098641ac4b6c---tavekizimoxa.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23171a18e2---nifabulaligefutaran.pdfIn PDF document text
- https://an-professional.ru/img/files/file/40337961599.pdfIn PDF document text
- http://bobmeetin.com/media/galleries/files/zomoxedatumedoxibabibi.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701ca767697---6269194812.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54ac859cb---74840778298.pdfIn PDF document text
- http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/2a29vdu6gsk27gl2j3lfef7gbv/38606541996.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f62ea2f7d1046dfd3a155d03ea9272fc/12378273096.pdfIn PDF document text
- http://sitoad.com/bbqjoekey/files/202109062203159023.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/zekulap.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_off0000c7fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e015.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE015	10272 bytes
SHA-256: `3de4907c0142d5e9c280b38628e7c24beef8f9b04d32d8e222b7c72c9e51f3ba`
`font_02_sfnt_off0000f6f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6F2	17828 bytes
SHA-256: `18a8edc053c9178b81d733ec0c127021fc8cd171f0d6f824b562607766e91fe1`

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