PDF malware analysis — malicious · 83ce9e9dfaafda2b

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 11:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: af19b848e70c96eb4535ae333f053f67 SHA-1: a70101d30b3bfdaa38f62b33896207ef36c56e50 SHA-256: 83ce9e9dfaafda2bdab5d4533c880df9934d3bfb8f346e2cbd0fd5c49818bedc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to compromised websites, many of which are hosted on WordPress installations using vulnerable plugins like 'formcraft' and 'super-forms'. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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 https://infrive.ru/uplcv?utm_term=we+can+be+heroes+forever+and+ever PDF link annotation
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096713eeec17---47486313800.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/zobare.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5395b577---sugegizifitenim.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d17b4ec82d9019e636372937deceedbe/53239308972.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f2722ed---tedakezevirekomesekizewid.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3022795e---18296892342.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdfIn PDF document text
- http://berbun.com/user_img/file/fenavi.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d23c495c---xotuderusuvarujama.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b06ce45aefeb60491a629d93085a09af/52603242659.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/53bbigtkg1vofno1i6qm53osq8/729488025.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0ccb0fe0---xujesofonad.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607626867803b---33787188157.pdfIn PDF document text
- https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0s55o84jd9ufjnhpn92s272t07/47182406130.pdfIn PDF document text
- http://www.bordadoindustrial.com/ckfinder/userfiles/files/badebir.pdfIn PDF document text
- https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/f8c10b36f04a1db9679408c8ab84d865/28922789634.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/nobuzofilurojuxudetopuk.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098458a54444---9540711501.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422960913a---kojojakemegunutuze.pdfIn PDF document text
- http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/19226741176.pdfIn PDF document text
- http://collegium-connect.nl/ckupload/files/95204011434.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_off0000e7c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFD2	17144 bytes
SHA-256: `cc0f64a7e62b90ede2791c35e867e47c4a528e4888c265df06ef89c46bc55342`
`font_02_sfnt_off00012c76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C76	10536 bytes
SHA-256: `c93f63433d4b4db42e1e5cc74a9a4bd174ad5fdf5d600940c8c3965af3b09496`

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