PDF malware analysis — malicious · 5c99ac6c801f288a

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 22:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d3f94b948bf0bd968552af93ece5aa28 SHA-1: 4b6273108be6bc47cd6afe8ebf1648f980bc6e57 SHA-256: 5c99ac6c801f288a297661b0a78177738b8bcc5120c2af3e70f75b35957b7095

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and link farms, suggesting a phishing or malware distribution attempt. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=paid+fortnite+cheats PDF link annotation
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161417d60d7d34---60721991334.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/31961920436.pdfIn PDF document text
- http://studiorinaldibedin.eu/userfiles/files/85548241274.pdfIn PDF document text
- https://bisleri.genefied.co/ckfinder/userfiles/files/67061778887.pdfIn PDF document text
- https://sua.vn/uploads/userfiles/file/tibewosemo.pdfIn PDF document text
- http://dent-pro.cz/pic/file/kesuvapaz.pdfIn PDF document text
- https://wic-net.com/userfiles/file/satikinijezineto.pdfIn PDF document text
- https://dunaweb.co/bg_image/files/nirulolisafogaxagatop.pdfIn PDF document text
- https://giorgiosantinelli.it/file/89627426395.pdfIn PDF document text
- http://imailbox.nl/images/uploadedimages/file/xomepaditerexitukufafuw.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614975726ea59---57514882442.pdfIn PDF document text
- https://brihat-group.com/assets/userfiles/files/15785814662.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/392a441be085b0dafaf2c91cbc3251bb/7310788645.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613638a1ca8aa---17920741090.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ea523aa87---8255169424.pdfIn PDF document text
- http://kimandyoo.com/userfiles/file/28308982787.pdfIn PDF document text
- https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/39261800893.pdfIn PDF document text
- http://ghalemdi.com/userfiles/file/nimugipubew.pdfIn PDF document text
- https://iwanbim.com/userfiles/files/16163115111.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/6841584991.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qsthjeba73fnd6ievrdvtn6s4n/refabojejopobepisodu.pdfIn PDF document text
- http://jurabos.nl/include/editor/file/47527644820.pdfIn PDF document text
- http://aftp.bg/userfiles/file/bajekigabesamewot.pdfIn PDF document text
- http://familiegravesen.dk/userfiles/file/15393787461.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c60d2b545ae76b5d298a7f9c5ae61b4b/56055737805.pdfIn PDF document text
- http://baheth24aqari.com/ckfinder/userfiles/files/kasojuwuxenigi.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_off0000de4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE4B	10528 bytes
SHA-256: `84e3eef01fc314cf95461b301dde2868f4e8c49a171303481a65af81b6b05098`
`font_01_sfnt_off0000f62a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF62A	18112 bytes
SHA-256: `ac0b5f6fea14c2602f9d1075a8da8be7420349cfbba0de425165aaf3d766ecf0`
`font_02_sfnt_off0001246a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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