PDF malware analysis — malicious · 36ddde9a480a9fc6

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 07:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2bf4a0c6a27212f4f868569dae9bf270 SHA-1: 1c0137feac22aed82559b6cd2507f2ecc6d143bf SHA-256: 36ddde9a480a9fc6c28f51c2a3eb9f1cd1c77a27fca90fe7c5da4fcaf2c223c7

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 it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://queure.ru/uplcv?utm_term=laser+level+app+for+android PDF link annotation
- https://alansglobalservices.com/ckfinder/userfiles/files/17578729136.pdfIn PDF document text
- http://ain.proximeo.com/ckfinder/userfiles/files/88774138562.pdfIn PDF document text
- http://www.smartusb.info/images/library/File/falewipezonobozaguze.pdfIn PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/jasodi.pdfIn PDF document text
- https://associazionemusicaviva.it/uploads/file/98183829006.pdfIn PDF document text
- https://dmshospital.com/mm_engg/files/66960901835.pdfIn PDF document text
- http://edmo-cars.nl/images/file/4313440039.pdfIn PDF document text
- https://www.willmarshelter.com/ckfinder/userfiles/files/jakagewuruvi.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4e07407c30e40b642487c51835b7e9a5/nuxakuwajijegisa.pdfIn PDF document text
- http://german-ex.com/images/blog/file/tutojaresuvega.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb4ec16f7---wikuwo.pdfIn PDF document text
- https://z87992961.com/upload/files/20210901105605.pdfIn PDF document text
- http://studiofranzoni.eu/userfiles/files/pawekowuwopanagojojajeman.pdfIn PDF document text
- http://sensi-leszno.pl/userfiles/file/98204459303.pdfIn PDF document text
- http://aotwresort.info/ckfinder/userfiles/files/saxuta.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1b6b0debfb0ee26032e77c5153f144b1/35447826988.pdfIn PDF document text
- http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/vujujorixotufewozajo.pdfIn PDF document text
- https://amd-export.com/site/upload/file/63873116095.pdfIn PDF document text
- https://thegioidongphuc.net/ckfinder/userfiles/files/sisulunizopobekoz.pdfIn PDF document text
- https://thietkewebseo.com/webroot/img/files/xinunem.pdfIn PDF document text
- https://confidence-ist.com/ckfinder/userfiles/files/80876001586.pdfIn PDF document text
- http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/88126064180.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/pavebutaxutujisoramo.pdfIn PDF document text
- http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/11577677296.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_off0000e44c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE44C	17440 bytes
SHA-256: `8d4ea0f0f64311d42c864df55a3c9914dcbf4f2e36d8ff442a791e222ee47088`
`font_01_sfnt_off000111ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129C4	10416 bytes
SHA-256: `8a87e642d2659bd0ee22eff47cc1b8376d0afd8989d069f819e80eedd86a00bd`

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