PDF malware analysis — malicious · 83a797ae72a5ffad

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 23:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 470fe7f4b6295cb25766279adeeb25dd SHA-1: 076063964fa8e00ce79b58cd330e43018b979bcf SHA-256: 83a797ae72a5ffad397a6901e37f35db5ef2b68c04ca97eb16cced6f07d69c9c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts hosting PDF files indicates a broad effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd2e5d2a---jolexazug.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d19809cd0---80311461149.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce05c3036f---99205784274.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d2127001---fasaponokadud.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7a96de12---nitegole.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///detefiwu.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/660a37b377322adaf612e57c30169731/xedexogigogupiwafuti.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210526034738129.pdfIn PDF document text
- http://xn--dlek-5qa.com/admin/UserFiles/file/61448702576.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/41273a8aca51381004af08ea43d25674/xulavikidomorapukejof.pdfIn PDF document text
- http://cungcapluonech.com/upload/files/fepilatogaxowito.pdfIn PDF document text
- http://jkmdc.com/aversystem.com/userfiles/file/wusolo.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb3fa7946---83980429394.pdfIn PDF document text
- https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d057c5de134fe04744d8fe3358244df9/17408358289.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ske5bl2pu49heck81ojq7rhk65/52971531716.pdfIn PDF document text
- http://alituncer.com/userfiles/file/62880959577.pdfIn PDF document text
- https://e-fasteners.eu/media/file/15206216774.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdd53c966---37019712698.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b030e9746efb0fefa4b9c12aa4567c3c/22916100242.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92d043c7af449166a8931e4556de5f1f/jutomepidufa.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5372587cf---kakazajeratozobor.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81f6b30d8---xukenoxoguvikoved.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609544acc63d5---zolexafarufedixotuwatodem.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3f8d55040d7a602a6d773bf2caa30edc/naburifikekasefedatak.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=index+of+the+brave+season+1PDF 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_off0000ed56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED56	10624 bytes
SHA-256: `c12f7a2e2cc9a5a549c6afae1040f796fdbcd3d576cb8411dc55f20683250ec9`
`font_01_sfnt_off000105a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011db9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DB9	17336 bytes
SHA-256: `f1c62444239825bbe7a51b3d7b201fcf936ec691be265d7272022549b8a63010`

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