PDF malware analysis — malicious · 223080f96b3eac8c

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 14:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b3c488acbed707781389e4b0070732f1 SHA-1: 08a286a33716fd80dc956cafd834c163bc16495d SHA-256: 223080f96b3eac8c03d487aaf5c2a4739b02d2ee7a5811a9ad5457ccd0314a60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for further distribution or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=kakababu+comics+pdf PDF link annotation
- https://cuacuonbentre.com/upload/files/69233267064.pdfIn PDF document text
- http://oxigensupplies.com/shipinc/userfiles/files/57788118232.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/313b1de426842ffd5306c87a6099f2b1/96259626932.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5777c79b---13203409665.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b090730c0---74156295473.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/zuzikibadoxixupemakin.pdfIn PDF document text
- https://totalsewa.com/userfiles/file/gotokelinizeraketejivabu.pdfIn PDF document text
- http://dealershop.es/camarasegovia/userfiles/file/30852893108.pdfIn PDF document text
- https://okazionche.com/files/kexowelikebatakawubutin.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/sovekil.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/34417191528.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408b5f793f7---39882473857.pdfIn PDF document text
- http://zlzljc.com/uploadfile/file///2021091312173480.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/99549837599.pdfIn PDF document text
- http://intertexmedical.com/userfiles/files/webudujakaganetizated.pdfIn PDF document text
- http://jolanyee.com/upload/files/202109151609378851.pdfIn PDF document text
- http://www.enfersalus.com/ckfinder/userfiles/files/60973503383.pdfIn PDF document text
- https://dildendilecevirievi.com/upload/ckfinder/files/34475185731.pdfIn PDF document text
- https://media-get.ru/userfiles/files/41611618017.pdfIn PDF document text
- https://selapro.com.au/application/third_party/ckfinder/userfiles/files/tisomamasarijetofekil.pdfIn PDF document text
- http://captainkillmite.com/uploads/files/202109161326438068.pdfIn PDF document text
- https://perfecthospital.org/FCKeditor/file/40479518419.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdfIn PDF document text
- http://votejoedestefano.com/editorData/file/77278837472.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47c7e0605---wujuvalugekixeviki.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_off0000d451.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD451	18164 bytes
SHA-256: `1d6990cdca5a3b95465b826fa6607cb5d0dbc184db6533140701ed4cbfa124c0`
`font_01_sfnt_off00010385.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10385	10624 bytes
SHA-256: `6cb17df74715fd373b2995a0b6df83a577df218364cde6067cd406edc590d119`
`font_02_sfnt_off00011ba0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BA0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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