PDF malware analysis — malicious · 29a6285c42eeeafe

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 23:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: eb005d197e32fd5a99f6dc2b9b139b35 SHA-1: 41e3ddf070667b68273a0ad9969091bbf9dfff5b SHA-256: 29a6285c42eeeafe47dff442578e212e6f04ee41c6eb3bf99a9a10cb9cdeeb82

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable domains. The presence of URLs containing 'utm_term' suggests an attempt to track user engagement with lures related to software downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=windows+10+loader+download+64+bit+free+download PDF link annotation
- https://jocafoto.com/fotos/file/vozuxozid.pdfIn PDF document text
- https://testagenda1.myagenda.cz/pictures/editor/files/vemexuroranunokozelavi.pdfIn PDF document text
- http://446888.top/userfiles/file/39190941806.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb2abc3e6---77973532104.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/vokovenasagoxegi.pdfIn PDF document text
- https://myagenda.myagenda.cz/pictures/editor/files/gimilivitivenanobo.pdfIn PDF document text
- http://sipsak.nl/userfiles/file/69253264674.pdfIn PDF document text
- http://floridadressyourhome.com/uploaded_files/userfiles/files/nupimirexa.pdfIn PDF document text
- http://byecook.com/ckupload/files/kutotakexudimi.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/95380883880.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137db609b989---95469697639.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kcafispdqir71esamc2sqm291n/26340159909.pdfIn PDF document text
- http://mega.kz/media/upload/files/60585076945.pdfIn PDF document text
- http://semanbio.com/upload/files/77042501674.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141165316485---16736835625.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/32fsgc0kege1grdcgo0ild3se5/zesesisovukadimukezevak.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210906075022580.pdfIn PDF document text
- https://beautydiction.com/ckfinder/userfiles/files/dasemaxisijagu.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/tuzema.pdfIn PDF document text
- https://tbsva.org/Upload/files/20210910121420.pdfIn PDF document text
- https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/tetizasetiwofikibutorodek.pdfIn PDF document text
- http://pescepiana.eu/userfiles/files/tagemopibabolabokilepivu.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b62cfc313e30d65448a0fc8593b91db/xapigokiluki.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c712043197---lesegomovisaboxoxujotijix.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_off0000d9ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9BA	16628 bytes
SHA-256: `8cfc82ede3d0fe3e9e1415a1b365858e7b07b41feeadde0998cc11935fbbb76a`
`font_01_sfnt_off000104cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ce3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CE3	10988 bytes
SHA-256: `1e9d2920ebf2b1ffe7b42dafb75d2bca3ec2b88813b9d340dc507daaef879af7`

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