PDF malware analysis — malicious · 698f8280a9858b62

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 08:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 4e19299568e54ccb0eb98d9fea1b781b SHA-1: f83c5704c5a2d57dbcba25f0e91b6995acbd8594 SHA-256: 698f8280a9858b62b1afbec48d8120f758a089ebc91d50a105c36e9e9ce96904

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to compromised websites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=topical+grammar+practice+2+pdf PDF link annotation
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/jai71uht50kqehbc59l6l9q3t5/zulilotozavuzibexu.pdfIn PDF document text
- http://amsaneeraus.fi/userfiles/files/gejaziwadalatu.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/21871317543.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59b286376---vizirewitupupajila.pdfIn PDF document text
- http://zonazero.es/userfiles/file/29202495756.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/nolasuliwafuseganulugetis.pdfIn PDF document text
- http://tsrmmessina.it/userfiles/files/fejunowowitigazola.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/9cc8a7b1b330563757e460ce3e3585de/notivobe.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5c94a05dee6a002570f2b10cb703b4f8/6601938509.pdfIn PDF document text
- http://beiks.info/public/file/forosojasekajeb.pdfIn PDF document text
- http://be-now.pl/userfiles/file/kumowevaxajopanilibo.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/85530392933.pdfIn PDF document text
- https://bandotrading.com/uploads/file/mediro.pdfIn PDF document text
- http://samafb.org/uploadfilefiles/1170573643.pdfIn PDF document text
- https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/dqprvvva9fjibrm389tpl00bei/40519622199.pdfIn PDF document text
- https://mehreganimaging.com/images/upload/files/63332119080.pdfIn PDF document text
- https://www.myosiaffiliate.com/199trust/img/file/xikaxekinogijozusamaboxor.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1627457062.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842edde86d5---90183323853.pdfIn PDF document text
- http://salespate.com/userfiles/file/bikezabisufotabovixoxul.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4efcdc747d---10521516048.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-07-16/images/files/93634535145.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dkd3n23jj41soc8ema8qddlarh/peferumizasogexusut.pdfIn PDF document text
- http://agro-norwa.pl/userfiles/file/xagifunusibikopuletumor.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2eeca673282db8eb09345df526c3d557/18440937288.pdfIn PDF document text
- https://unserbiokorb.ch/userfiles/file/befusozufovaxigixanewenox.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_off0000c1e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1E3	17476 bytes
SHA-256: `7b0c7155896d47d9b8757fe9f8cb2bd0e797722fc369f5c15d941764e0f17e6b`
`font_01_sfnt_off0000efff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFFF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010816.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10816	10772 bytes
SHA-256: `3ec911aa1596f42aab2a2fc375f9da22b72b7575ce07bfcb60a8a2511fce70f2`

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