PDF malware analysis — malicious · d810a90934e57e66

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 17:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e9842877b4b3f5f754a99cffd8e2d394 SHA-1: 3ac3d3814b1e1f4410cb2695f2d623d2757f1cb4 SHA-256: d810a90934e57e6697e7457b75ad6a7de93bb2935a3ce15c25e414d7d57154e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or redirection mechanism. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://blagoustroystvo24.ru/ckfinder/userfiles/files/77762873158.pdf In PDF document text
- http://gazetavk.ru/img/file/89247371928.pdfIn PDF document text
- https://srmhomes.com/images/bulk_images/files/bomegilowamupowasu.pdfIn PDF document text
- http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/76341209750.pdfIn PDF document text
- http://wildpflanzen-planung.de/file/susenefisapaz.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa006af3fe---sufikujuwojepifugiputu.pdfIn PDF document text
- http://dorrstrechy.cz/UserFiles/File/jirufabelekin.pdfIn PDF document text
- http://hasyo.net/files/file/83532614527.pdfIn PDF document text
- http://studiocariola.com/userfiles/files/tumosemijesojugamozur.pdfIn PDF document text
- https://schmitz.cz/res/file/9127007065.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c898a9dd9d---nitadini.pdfIn PDF document text
- https://pointvirgule.ca/upload/editor/file/25593645020.pdfIn PDF document text
- http://namlinhchisapa.com/userfiles/image/file/84712981954.pdfIn PDF document text
- http://zakuskymoser.cz/www/ckfinder/userfiles/files/25470799290.pdfIn PDF document text
- http://taiwan-casters.com/userfiles/file/95263165069.pdfIn PDF document text
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f9c8997c9b02efb8915873b3e2cfac17/sovelokavoxikax.pdfIn PDF document text
- http://dejede.com/userfiles/file/30108235968.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/210904032133049678usv65.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8f6048ee7ed3f8f684c4fcb29f45864/pulawasafinipi.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af2f1f9d7---pibaxitagivawovaw.pdfIn PDF document text
- https://nisahanpin.com/calisma2/files/uploads/borubevawire.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf098494b3---lipelizupakoriv.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094221ba669e---4188397572.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fa7c481292be5a8106bf6f8baf5f3e0/29660526468.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ct8nv8ih2u2hp6go7oi14p5ad1/pavetelukagokudeluneduk.pdfIn PDF document text
- http://www.neoneofitou.com/ckfinder/userfiles/files/4647656559.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bolognia+dermatology+pdf+free+downloadPDF link annotation
- 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_off0000d884.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD884	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f09b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF09B	10928 bytes
SHA-256: `98adcaec1dc813053b7d41ed7919e1eb667ead69476ae95d2c87ffab67b8586a`
`font_02_sfnt_off000109c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109C3	18140 bytes
SHA-256: `5d83ecffdfa11f92e299e1580d8f48514c51f292087d1ac27817e7f7bcae5802`

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