PDF malware analysis — malicious · 804ab9fcdadd11ce

MALICIOUS

PDF

99.2 KB Created: 2021-07-14 02:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3b60877b3c780c03234cca9a05562956 SHA-1: f046e5662e35fe8f43c8d4a40862c37b2666c621 SHA-256: 804ab9fcdadd11ce69729e1fe40cee508ea7915f2ef604f01862b8c91c32fd2e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm or distribution point. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports this. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

Heuristics 5

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://www.barbazan-debat.fr/ckfinder/userfiles/files/82619308655.pdf In PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6oq85slq8v5g53qtldsgdq54c3/giwolufasugur.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808c6516c4---41558016767.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/drfp2sok818p67blf4a8c1ora3/gewemirabimoxagugobineno.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///7979421480.pdfIn PDF document text
- https://vvpta-irvine.org/userfiles/file/2493526366.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/62b892fbda4430a21c0f9be3481067d9/92454447183.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/24c05c1c18505a84532a921a223dbacb/xizezozuwoxelibova.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/11b9b9ea71553ea4d07a682a789c6586/xosekapad.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7dc6e15d---41184507163.pdfIn PDF document text
- http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/140557947.pdfIn PDF document text
- http://diagnosticaedilizia.com/userfiles/files/89782835255.pdfIn PDF document text
- http://baggiez.net/userfiles/file/tiruruxa.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f78e0bdce6e529ebea665048815cbf4c/15707299830.pdfIn PDF document text
- http://ahsaipu.com/v15/Upload/file/202155533505218.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c32b10f9---migepopidadosunam.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/89056754623.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=promote+meaning+in+tamilPDF 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_off000116d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116D5	10284 bytes
SHA-256: `db195b942c189953011f81c98c61a7554e8910cb9a664d0bc286fce0a27ed84f`
`font_01_sfnt_off00012dee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014600.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14600	24328 bytes
SHA-256: `af91e6639c4c4f2acfbc7ea48275561e800b30c33528282d9352c66f56068ab0`

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