PDF malware analysis — malicious · ebd0e05c5187a29a

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 04:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fd07e13105a514afbfd458b7615a59d9 SHA-1: fd8469eb070118266c40e002f040edf727b4724d SHA-256: ebd0e05c5187a29a847aadc18e28c31b2a6df568cf3117b00c2b543e9915bbef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting domains, often with UTM parameters suggesting a phishing or download lure. While no scripts were directly extracted, the presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=download+video+star+android PDF link annotation
- https://rafaellopezehijo.com/upload/files/devetezetaje.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161463f8b41301---49072389208.pdfIn PDF document text
- http://stowarzyszeniemalyksiaze.eu/img/upload/files/boman.pdfIn PDF document text
- http://humanlitech.com/files/files/19659980142.pdfIn PDF document text
- https://weboonline.com/ckfinder/userfiles/files/54668335605.pdfIn PDF document text
- http://www.luna1956.com/images/library/File/70871839157.pdfIn PDF document text
- https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/15362857980.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe02393717---91111255474.pdfIn PDF document text
- http://celeb.huh.hu/UserFiles/File/11509962144.pdfIn PDF document text
- http://taiwan-tsai.com/upload/files/94136869773.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb5aef582---83512541150.pdfIn PDF document text
- https://indiansecuritisation.com/ckfinder/userfiles/files/wujedafetu.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136cec32c36d---82731926956.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j7vbf2rjamrvh4shkrm6e8al53/52975489893.pdfIn PDF document text
- http://sva-jeanroze.com/xmedia/file/93448711115.pdfIn PDF document text
- http://letdentalab.com/img/files/33511165161.pdfIn PDF document text
- https://myclubowners.travelenvogue.com/userfiles/files/xotoxekifex.pdfIn PDF document text
- http://diagcorlifescience.com/attachment/file/pobogozibidawuv.pdfIn PDF document text
- https://playerpress.com/ckfinder/userfiles/files/79498925788.pdfIn PDF document text
- http://indago-rovigo.it/userfiles/files/vomopirusizapajezizuma.pdfIn PDF document text
- http://katela.net/userData/board/file/3219101382.pdfIn PDF document text
- http://thedreams.cz/files/sajipiwelogawofo.pdfIn PDF document text
- https://granitabrasive.ro/editor_up/94056293842.pdfIn PDF document text
- http://kpotplace.com/uploads/files/tuluwizifumubegalodivi.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_off0000d765.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD765	10392 bytes
SHA-256: `8634631be27993ed93b67f670c29ddfbf7afdae5a5cd897171d13e6fc4a69b28`
`font_01_sfnt_off0000ef0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF0F	17132 bytes
SHA-256: `e134809bd3d7fae85a3b5dd644ef7cf6668e29870678767aa231fd80099841ba`
`font_02_sfnt_off00011b67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B67	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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