PDF malware analysis — malicious · 2c4bad473ef250be

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 19:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: bdff097ea1b74d144bca369148d5d349 SHA-1: 751920c5bcfa8ad7794fa42a7ba9aad3f6a52773 SHA-256: 2c4bad473ef250be530251e5ce4483f1e2226ae475e243de564b2baf05c8b8b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://etcad.net/np/upfile/file/59660091920.pdf In PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6568a86d---57866243793.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/87dde235bf94511ecea28d553168ce26/maxepuxisodezawexigufurom.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d84092839---1841659953.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf119fb69---bisesutizopagaveja.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49a95b335fc2de767a2fac279588994c/perokura.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508d668602---jurutitepawikef.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/kofobowabokopixaku.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbc0baff2---dagekegukemu.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b58c89c68---katowirilipomepexozos.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/97946992198.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8bf50c72118fe857e70777baba8cf924/pigogujil.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b4722535c9bc4a047e3467254fc4ef2a/wuzelurumutuga.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9251123854---gadego.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3b4fe321344fdac6b79bb03859002b7e/40904960616.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085181e1009e---24185839582.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tj8jtuvs3ujephr7usjfp4i62h/21030820671.pdfIn PDF document text
- http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c7502dd86---watijojiwulepogo.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/xomonenilinavu.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/u1orq13gr33s1k10pdp85dskms/tonokosipefotinoguf.pdfIn PDF document text
- http://caphegiabao.com/upload/fck/file/zomefafulupez.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1e45e1f---8925460751.pdfIn PDF document text
- http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vifuvidizezawokixafa.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/17806363294.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24ff63c75---doxep.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4167bfccd81cb8d199f77ea173b732b0/suvijupadizolo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=band+of+brothers+novel+pdfPDF 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_off0000f77e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF77E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F90	17332 bytes
SHA-256: `1c1324d84e823f3c8c6bbe713920868066b3b7f0ee940f63500d54780b690070`
`font_02_sfnt_off00013cb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CB6	10760 bytes
SHA-256: `3c3c89d165a2769acbc634421bd6ed18c4fe9ad8b0044301425333dba2e27a0d`

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