PDF malware analysis — malicious · 87747cf7efd9e2fb

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 04:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: e5bc9eb6d362b03ae2e80e2c7ba888a8 SHA-1: 7b08f202cd64a01631f30c73ca790db924b90458 SHA-256: 87747cf7efd9e2fbcd31bdf2bcd4faae8eadb182f75fb7074d9608b4f8ab7605

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites, some of which are hosted on disposable domains. These links are likely intended to lead victims to phishing or malware download pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://brandweeramsterdamamstellanden.nl/userfiles/file/29387156911.pdf In PDF document text
- http://evaemlak.com/userfiles/file///xolalubibugo.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16141b1edf2bea---gufigisijobotatigizij.pdfIn PDF document text
- http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevokozuvevijefevavaz.pdfIn PDF document text
- https://groupekheidri.com/ckfinder/userfiles/files/kakesiwododixigajawo.pdfIn PDF document text
- http://lachambredechos.com/userfiles/file/42717137765.pdfIn PDF document text
- http://vector-mebel.ru/uploads/files/falimenu.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131495f41faf---29976992709.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161511c7d2e015---makosagotawawafuvexurer.pdfIn PDF document text
- https://ximatinhdongnai.com/app/webroot/files/images/pages/files/zalarulozususo.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a2f1d750---rurepixu.pdfIn PDF document text
- http://bagiez.com/userfiles/file/28503128945.pdfIn PDF document text
- https://alirezamirmohammadi.com/images/upload/files/82814579875.pdfIn PDF document text
- http://cisseo.net/userfiles/files/46326046713.pdfIn PDF document text
- http://esoftland.com/userfiles/file/gavevi.pdfIn PDF document text
- https://atlas-consulting.ro/fckeditor/fisiere/file/73640431081.pdfIn PDF document text
- http://ecole-belair.com/ecole/file/34232677679.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/5656714098.pdfIn PDF document text
- http://liubeauty.com/luutru/files/47769710586.pdfIn PDF document text
- https://hoanghaie.com/Images_upload/files/xixobib.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149569083129---13205905151.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420d6dac81c---53732802461.pdfIn PDF document text
- http://trieuduong.com/images/Download/1854580388.pdfIn PDF document text
- http://traiteur-ribot.fr/userfiles/file/52272853609.pdfIn PDF document text
- http://dedanskecasinoer.dk/userfiles/file/monovukudofesaniz.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vue+ui+frameworkPDF 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_off0000bb72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB72	10204 bytes
SHA-256: `047da7282b944d080825391a7cea7eb5c4cd7f06ac8b91f10635d27c59551e03`
`font_01_sfnt_off0000d26b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD26B	17764 bytes
SHA-256: `d937845c5284badd864090a975006ba5aebbea8e25230ae8e8e52c5d9960efad`
`font_02_sfnt_off00010040.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10040	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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