PDF malware analysis — malicious · c1bd09dea4fd9c30

MALICIOUS

PDF

89.7 KB Created: 2021-08-12 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 39a2718a0a5991e9864bbc981ec1aca5 SHA-1: 40b2884ced735935c39d25e9426b4c2f38f1f931 SHA-256: c1bd09dea4fd9c30775aac5ee625d5ca21ee0dd8c8539c7937e478870179abff

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://kaupa.cz/userfiles/file/bugani.pdf In PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997e02dfa---dumokonaxixulononujokovij.pdfIn PDF document text
- http://stevis.cz/files/file/47467678087.pdfIn PDF document text
- http://ciaooo.ru/uploades/userfiles/file/vanenutopugizon.pdfIn PDF document text
- https://oddluzanie.net/userfiles/file/jiwetuzutotiwaputuwaki.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51f3a937f---xozisarokeborow.pdfIn PDF document text
- http://lachina.cn/upload/file/loxamofubejowo.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8adcbd58fb11a53a280547c9b1766fa6/komebesatufelawakibolafe.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/86465107122.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073762c47141---vevuwalobevatowonigovivoz.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/fuxuvixidub.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079f837d6220---livogunixofurukafilupabe.pdfIn PDF document text
- http://infinity-pro.ru/userfiles/file/tuneba.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9bb27a37ac967d5970f9d2a9fc2b06d1/pajukonufekunot.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/nifalorokuvu.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001ea8a58f4---74106610588.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/39d95b84e704fa19c70ac29cb4777635/89667508411.pdfIn PDF document text
- http://www.moyekolodin.com/files/22703073505.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/30c4e1d27498424277ece4f34d248ad9/paton.pdfIn PDF document text
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1278eaf58ad99424122d119dc15f0322/samotibewuwanobaloz.pdfIn PDF document text
- http://ventiliatoriai.lt/js/ckfinder/userfiles/files/30040245006.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/37f7c063979796336d30088fbc5f1c72/tafapebekekin.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/92067215a3f31944840f49b1f8b7aa20/15335579067.pdfIn PDF document text
- http://hasyo.net/files/file/84923327111.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cycling+shoe+fitting+guidePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f2a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2A0	1732 bytes
SHA-256: `5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a`
`font_01_sfnt_off0000fad0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAD0	16668 bytes
SHA-256: `c630f075302fda7ab17664d0f8611a72c7ff02c46cf23c0084c225ad3fcadff4`
`font_02_sfnt_off00012609.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12609	10736 bytes
SHA-256: `0f5f7638a143af444d5aa1927d9e704bc4ef02e7b048101a13b397bea3dbefb2`
`font_03_sfnt_off00013e75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E75	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.