PDF malware analysis — malicious · 1e6f6fca74b19d40

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 12:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 21ba4a41bf45fef5d5a3a39b97637319 SHA-1: bd26b297d953a1e08bd0715ad5471f50e27b3925 SHA-256: 1e6f6fca74b19d406314c2f35b7ccde8c4acd1574906b6270688427df4c6a9df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=los+mejores+juegos+fps+para+android PDF link annotation
- http://twtqedu.com/userData/ebizro_board/file/93203206716.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3661d22c---dupovisitexafikegepije.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4c3bcbff31363752eaf8235b9996ed04/56510849503.pdfIn PDF document text
- http://angelescare.com/userfiles/file/79844629269.pdfIn PDF document text
- https://goez1.com/10005001208290177/ckfinder/userfiles/files/nejuwokezigedesifovane.pdfIn PDF document text
- http://demenagements-remond.fr/userfiles/file/20210903225103.pdfIn PDF document text
- https://tallerescarrion.com/uploads/file/xopoligugusibikufiba.pdfIn PDF document text
- https://buddhaart.in/userfiles/file/nuresakilavunenel.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/0055866082.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/93958114547.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efaf4d8e61cad59bba1638fe77fad10c/resijufenokubiw.pdfIn PDF document text
- https://oolong-dining-co.com/webroot/editor-uploads/files/98981844297.pdfIn PDF document text
- http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gigobofaratuwuv.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dd902836---wojazadebuzitifode.pdfIn PDF document text
- https://idea-web.ro/app/webroot/files/userfiles/files/mimadubunodogelazesebab.pdfIn PDF document text
- http://ptaki.info/imgekoprojekty/files/54763353044.pdfIn PDF document text
- http://realfootball.gr/userfiles/file/zezibibofulolanadijeno.pdfIn PDF document text
- http://gruaszarate.com/ckfinder/userfiles/files/41743652125.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/lipuroposikedifijagev.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132603227f4f---89005171735.pdfIn PDF document text
- http://koryosushi.com/uploads/files/ropux.pdfIn PDF document text
- http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikadop.pdfIn PDF document text
- http://pnktools-th.org/ckfinder/userfiles/files/nanekes.pdfIn PDF document text
- https://dalba.net/other_files/File/345394747.pdfIn PDF document text
- http://89928386.com/uploads/files/202109121737502491.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_off0000e24c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE24C	19184 bytes
SHA-256: `bdc1d3121f74d6159e11a8319de3fe0db29dc332774e387984a0e64f6b85a1aa`
`font_01_sfnt_off00011388.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11388	10884 bytes
SHA-256: `5d9aa9e722823e8a222efef0ec14f042cf70637da124a32ae39827912cd8720d`
`font_02_sfnt_off00012c65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C65	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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