PDF malware analysis — malicious · cb50a21d2b091640

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 02:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 64c11c67a0a183c5e66e9eb139c43bcc SHA-1: b148b92204e4d0baaef9fc79085b154e1fb88543 SHA-256: cb50a21d2b0916403bd761c1942ede50fdcf8abd5a0dd017cc2287aff6a7f4b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to potentially malicious content or phishing sites.

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://coretry.ru/uplcv?utm_term=cast+to+firestick PDF link annotation
- http://szentistvanpatika.hu/upload/file/kudega.pdfIn PDF document text
- http://coyada.com/up_images/up_images/nevoro.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/gafijinikozezafukarixux.pdfIn PDF document text
- https://phunhai.net/upload/files/21864250985.pdfIn PDF document text
- https://deltarealestate-eg.com/userfiles/file/naguzedolazowajesuzijew.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/liseka.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/29cfae36b2ca8455ded56e60fe810673/zizesujevedutoputiworero.pdfIn PDF document text
- http://www.gc-antey.ru/ckfinder/userfiles/files/20187037041.pdfIn PDF document text
- http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/duterexipewa.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5979e458---33584268659.pdfIn PDF document text
- https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/zakuwo.pdfIn PDF document text
- http://csc-021.com/userfiles/file/20210903080528_027eki.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d38e5cd---17647743592.pdfIn PDF document text
- http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38956753341.pdfIn PDF document text
- http://sfipl.in/userfiles/file/57861703633.pdfIn PDF document text
- http://casaledellasignora.it/userfiles/files/witas.pdfIn PDF document text
- http://cc-loges.com/uploads/file/48390773436.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d1b9891e5---32061971482.pdfIn PDF document text
- http://studiotecnicodambra.eu/userfiles/files/pemolex.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/86d46addfa12bd3da1c173a951c31575/2873982509.pdfIn PDF document text
- https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/xuxefubareja.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/45067a32f2f3cbf90f7d06ba1dd60f27/91106328122.pdfIn PDF document text
- http://tsradviseurs.nl/mailing/images/photo/file/vavedaragizoxufin.pdfIn PDF document text
- http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/sogon.pdfIn PDF document text
- https://limberhurstgallery.com/imageuploads/file/xobotafe.pdfIn PDF document text
- https://sassanoproperties.com/FCKeditor/file/mexawateb.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_off0000df4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4D	17652 bytes
SHA-256: `b6c4adda72ba54891981614f416253cc2a7f43d6d017b5ad3449884ca53757ff`
`font_01_sfnt_off00010d68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D68	10300 bytes
SHA-256: `cb5bf088fd5c2c75b63577aa8bdfd3193f518753e8031e7c6dd6a006af4e119b`
`font_02_sfnt_off000124d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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