PDF malware analysis — malicious · e861b5a84ab47828

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 13:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 7c542d1962ae2247c189d3fb7d370d73 SHA-1: 2ddf3986a9ec227d2c40f1f2cea376b8ba4b9a62 SHA-256: e861b5a84ab47828a52768ada513ec7f27ff6b3a1534e7f9df1e63a0546dad02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially compromised domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The 'wkhtmltopdf' authoring application and the nature of the URLs indicate a likely attempt to lure users to phishing or malware download pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://bisleri.genefied.co/ckfinder/userfiles/files/190009377.pdf In PDF document text
- https://mobilaide.com/upload/editor/file/68150189553.pdfIn PDF document text
- https://safrano.pl/userfiles/file/pojazojafodegemujixobul.pdfIn PDF document text
- https://ldcpc.com/ckfinder/userfiles/files/rurowutagoka.pdfIn PDF document text
- http://fpole.ru/sadm_files/87075884134.pdfIn PDF document text
- http://ageddfjtjgrade.pretty-match.com/upload/files/pojobutatowezal.pdfIn PDF document text
- http://forma8.kz/ckfinder/userfiles/files/nuwedovatazuged.pdfIn PDF document text
- http://matras-devison.ru/upload/file/watanobo.pdfIn PDF document text
- http://ovecollection.com/royal/admin/images/products/file/lukuluromijived.pdfIn PDF document text
- http://www.jfac.kr/ckfinder/userfiles/files/jelekudedu.pdfIn PDF document text
- https://metrosecuritynepal.com/assets/userfiles/files/jugasik.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/totu0pp2tforaa02ki05uehfo7/lusedatozudabenavo.pdfIn PDF document text
- http://aromamahabaleshwar.com/ckfinder/userfiles/files/bababaginogigodadosaboxaj.pdfIn PDF document text
- http://lovelyspa.net/ckfinder/userfiles/files/fofulopajojorurulofenet.pdfIn PDF document text
- https://giverny-bkk.com/upload/files/pevugifusu.pdfIn PDF document text
- http://orthocarecentroortopedico.it/userfiles/files/bowigozisuwax.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a890f595dc---nasosoninomodup.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/03942b9b7e3bf31e8da839d506a1a941/sekivotujogiz.pdfIn PDF document text
- http://kubablimel.pl/Image/files/bofalufulolosunawamidago.pdfIn PDF document text
- http://cbestdesign.com/ckfinder/images_store/files/67964372761.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/gepakitopefop.pdfIn PDF document text
- https://ptogel1.com/contents/files/podogabijanufutorepoxudux.pdfIn PDF document text
- http://koreaseowon.com/ckupload/files/modajonafozivovumi.pdfIn PDF document text
- https://tbsva.org/Upload/files/20210910023009.pdfIn PDF document text
- https://nabsangram.com/userfiles/file/gozovibunovovugukameji.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+print+comments+on+a+pdfPDF 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_off0000c5ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ddc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC0	16276 bytes
SHA-256: `2dab6c6094f3088864b9e614d2769d26bbf5892096dad2c10c43c86518b1f5e8`
`font_02_sfnt_off000107b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107B6	10812 bytes
SHA-256: `e5faa7d8518fc66a69093fc43b074c9b6b47c11d72cfac01b63e4d6c4e1f1e4e`

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