PDF malware analysis — malicious · 5904976284829669

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 18:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: dc0518cd809554d3c48a2d7180f61a6e SHA-1: 8955673d9078d5d611a8f9cd2c735f72d6252271 SHA-256: 590497628482966937e107a011113879367341f3e1cc83da0068d115aaa9c262

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=frankenstein+historia+pdf PDF link annotation
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a9d79d35---62891772415.pdfIn PDF document text
- https://baongochoa.com/upload/file/28756439376.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a5e0374ebd14130e52d5ce02cfd8ebd3/42194953937.pdfIn PDF document text
- http://colantuono.it/userfiles/files/24720147457.pdfIn PDF document text
- http://orderbestwings.com/uploads/files/wedumekatebezirari.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4273d24cde18dc8e3df77e124262e71b/vogalune.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110b5e6b7a2a---fifowirojafinovub.pdfIn PDF document text
- https://edcasys.com/ci/userfiles/files/renopubimobemaxo.pdfIn PDF document text
- http://elitvorota.ru/f/file/pobuwipevesosaj.pdfIn PDF document text
- http://santeh.md/img/files/tuwudabe.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c1def5b3926---51238570108.pdfIn PDF document text
- http://piqiso.ru/userfiles/file/4052294074.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/41030673704.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a531c0367d5---sumowibabujufijudatizu.pdfIn PDF document text
- https://widepolymers.com/userfiles/file/95559266608.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210614055839_1694275152.pdfIn PDF document text
- https://x-software.cz/data/file/17539105228.pdfIn PDF document text
- https://csp-pub.com/stockages/files/satava.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64930c791---tenibagowolesew.pdfIn PDF document text
- http://olympusflights.com/files/files/81254816249.pdfIn PDF document text
- http://ankaser.com/userfiles/file/zemusajusafimezatar.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/505c36e50fb82111c0990edd9f4435f7/somotanemodupige.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092829e171b2---lubofokugetegoku.pdfIn PDF document text
- http://atreve.eu/ubezpiecz/obrazy/file/tuwaxerifipofubobodox.pdfIn PDF document text
- http://kripasec.com/userfiles/file/wetojikixatup.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_off0000cb1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e331.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE331	10620 bytes
SHA-256: `ec2c314c6d5f70c8681e1c3b3141422847210090bc1d2bc4855aa5dfd19f312f`
`font_02_sfnt_off0000fb64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB64	19916 bytes
SHA-256: `05acb0ad53fd0f26bbf2ef62f580fe4d504c5e01b4d17bc249d98f9d0a33a1e7`

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