PDF malware analysis — malicious · 28c77fa3be43cafe

MALICIOUS

PDF

87.3 KB Created: 2021-07-30 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 19aa312049868dfc60389d5321ac11d7 SHA-1: be31371881d3b846eeaf11379c3d9d64c431566c SHA-256: 28c77fa3be43cafe7db00585c3a31aa22604ad53eae4f907906e2072cf3f64df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates the primary goal is to direct users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9791

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://archism.ru/uplcv?utm_term=cissp+exam+prep+questions+answers+%26+explanations+pdf PDF link annotation
- http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/sisixijirirub.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8b6e2426---janifenuvoxalazenoga.pdfIn PDF document text
- http://shiokuda1.com/contents//files/76369862197.pdfIn PDF document text
- https://beautyyaurient.com/editor_upload/file/zofoka.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610342c2e9082---zanoruzesininisu.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f39ed878e---32860495023.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/kiwipasudegid.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c034d3122---98676232320.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef48e1f0b---rubenuzeburoxejaj.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6931fec6---76742018400.pdfIn PDF document text
- http://vimbark.sk/editor_uploads/files/10871253444.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rn9taojs647c8dn0otoe6vjj35/jatavex.pdfIn PDF document text
- http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/29949752618.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b118d64ea---86303690221.pdfIn PDF document text
- https://deltarealestate-eg.com/userfiles/file/7508512142.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d2cf6fc1ca36b3efc7dfb668cff3502e/pamoli.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idcqdq191vaoq1pkt1kk2l10la/95706548895.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afec804a---88325218912.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ac574dd30b39527110f648064e5fef8f/91199855519.pdfIn PDF document text
- http://ourpreferred.com/userfiles/files/48473655958.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8deb9083---18246588498.pdfIn PDF document text
- http://absigorta.com/E/file/joxet.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8fa51054---bajifigif.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q0flcao4mtr1mrv0n270ttkap4/sulafa.pdfIn PDF document text
- http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecc33cd61---83308603961.pdfIn PDF document text
- http://arohitourandtravels.com/userfiles/file/pudodevedabesavowaxesib.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_off0000ed89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105A0	10832 bytes
SHA-256: `a038aceaff5f85226210c97704bd4eaa640e5ed03ff2fc6e28b286a5d1deb02f`
`font_02_sfnt_off00011eb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EB1	18124 bytes
SHA-256: `315f01732c2636e62f622067a56c1de30483ef035a4b67a56d8f1d6eaa7c3c32`

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