PDF malware analysis — malicious · f92d825c7177678d

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 21:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: c28915f35006f2f8647da94cad2e165d SHA-1: 5032d8e71d3d6d15f3d2c39d91ae54f0e637a410 SHA-256: f92d825c7177678db86a834d906ab561980966387783723349e14e4da6268c6d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=casio+g+shock+mudmaster+user+manual PDF link annotation
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6aa918ffd---zavugami.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba450f1c3---gubokezekenujedajot.pdfIn PDF document text
- https://goldenapp.net/file/buvuxuxe.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/nanipu.pdfIn PDF document text
- https://niagarablock.com/application/webroot/userfiles/file/fikudanexamepenibunok.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7a4205cee40be272138014480b45595d/tevovevorafufizan.pdfIn PDF document text
- https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
- http://susanirvine.com/clients/82887/File/58435549951.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2f9930a5309cbea355c7290a65c067fb/timubazakigagotafiti.pdfIn PDF document text
- http://www.derbysignandgraphics.com/uploads/file/legitutobimubusufig.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/02dabefc9d74db140944035bba66865b/fuxutinepanonav.pdfIn PDF document text
- https://mavibusiness.it/file/titavusabumuwekojifot.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f079d5214---80253578952.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9fb18c763a4446e1d13aafb687bcfed2/vajeniwexugipudoge.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ae908791---vizuxiburodizax.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/32a4689375e35994a1c1d9c304970893/gaduratamex.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160debdd1ae506---83505882628.pdfIn PDF document text
- https://unibel.pl/pliki/upload/file/93198703321.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f899e0d376c---2157962901.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094128b3e1e4---menakumomolinemujaliw.pdfIn PDF document text
- http://santabruna.cl/upload/file/xizevazasopofosije.pdfIn PDF document text
- http://kindergartenhelden.at/upload/file/6628205917.pdfIn PDF document text
- http://kubabus.cz/novy-web/upload/file/97308101109.pdfIn PDF document text
- http://rulife.ru/ckfinder/userfiles/files/71145342911.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_off0000ea25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010237.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10237	18144 bytes
SHA-256: `38827bea57773bbabfddd7d4272254947136496e5b529a3fbba9619539783aec`
`font_02_sfnt_off000131d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131D7	11040 bytes
SHA-256: `250337536d4a4453a1c40205b00798ef7d8c1f02193605079c99668da7d24792`

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