PDF malware analysis — malicious · 4f6ce400333f9fbb

MALICIOUS

PDF

76.7 KB Created: 2021-07-16 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c18fdb2ba45f74cec6f608c350ecef7a SHA-1: 87184a3195bc24cacd672dd4a273006a1cd7acfc SHA-256: 4f6ce400333f9fbbe67f2e67c3886588cdb56e7bfa002b802b13527e4d4ce6ae

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a common tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/krpbqm8lq4v4sfkqjfaehqre6n/26949765765.pdf In PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8c1bb2534db4d6c0710093257c976867/ralaxanexeto.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/21863517271.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca48a1c53---rutak.pdfIn PDF document text
- https://rumahbaruku.com/contents//files/xefuxekizowu.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pochcvmnq89qfko2blkvro1su0/63691854809.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b17518232---nazozomuf.pdfIn PDF document text
- https://studiorampinelli.com/file/90682837692.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bc395f3f---noxopaxebigusuwanig.pdfIn PDF document text
- https://novahealthclinic.ca/userfiles/file/87424689349.pdfIn PDF document text
- http://kirakuramen.com/uploads/files/falenusebu.pdfIn PDF document text
- http://auburn-properties.com/userfiles/files/kutagukuzipafobekebowujum.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/91ab88f28330c76b78f3c53a9a29cb48/rirurodumekixej.pdfIn PDF document text
- https://flardochform.se/userfiles/file/wekev.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/55657213477.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c388678e375---tokexomenugin.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u2jd67o1600jlo6il018f3o4o1/3064999803.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/duxobituruxonopasupolo.pdfIn PDF document text
- https://led7.ru/file/54826639698.pdfIn PDF document text
- http://techscreening.com/userfiles/files/28152530614.pdfIn PDF document text
- https://tranduongauto.com/app/webroot/files/images/pages/files/9243613579.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tejqe1j7jc2d7keverob765lpu/9859056170.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3d73c68d174385c7648c552a05dc2ffb/74904323228.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/jugefamo.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/delidiwologukibimuwozis.pdfIn PDF document text
- http://asbazainville.org/userfiles/file/83344423293.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=new+year+background+images+hdPDF 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_off0000c703.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC703	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF1A	11184 bytes
SHA-256: `9606ee51eb0fe5fad1f6efe54223bb9a9ddcf4b472b06bed4952147e0df838d9`
`font_02_sfnt_off0000f8f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8F3	17064 bytes
SHA-256: `d0eb894e01895528a126ce6ef9e7a8cacc0f038aabb1c0ea9913a400b96412d5`

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