PDF malware analysis — malicious · f68ac1f85738a02e

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 00:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f246d263ecfa82ab5ba4534f382f172c SHA-1: 7a8fe24b9dd7f3ab5531a04734a9c0028fe086c5 SHA-256: f68ac1f85738a02e773381493df9b6929db2467591ccc334e7304c7a1fc08b6e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, directing users to potentially malicious sites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://oniceh.ru/uplcv?utm_term=ras+answer+key+2018+utkarsh+pdf PDF link annotation
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161158759c5dd2---vawinibuvubazewunanepu.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10af00adc---fotepuxakem.pdfIn PDF document text
- http://tourbusan.net/FileData/ckfinder/files/20210826_478AF264BC102193.pdfIn PDF document text
- https://ksboutlet.com/file/files/tatagexanujevalusizuke.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/097493d547767b46d285914d238380ca/45923769864.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779aedb3932---96028798922.pdfIn PDF document text
- https://hanahana.vn/media/ftp/file/pudukusajus.pdfIn PDF document text
- https://livres-d-art.com/ckfinder/userfiles/files/pelagalulanalorisepo.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f479f7bde5---fevuxup.pdfIn PDF document text
- https://lifecareproduct.in/ckfinder/userfiles/files/95870049783.pdfIn PDF document text
- https://trvstore.com/userfiles/file/gebapizedonafezited.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cde24d497---samosirogonoko.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a434b3c6c62---vaxedikerolelorukagolix.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/41600891452.pdfIn PDF document text
- http://baldonimarcostudio.eu/userfiles/files/lesuzepirolasoleken.pdfIn PDF document text
- http://yds-wcv.jp/free_images/files/fixowetibiwilu.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/79621262520.pdfIn PDF document text
- http://hurtmar.pl/Upload/file/riridejojodidapawoliju.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5cf7c8074e88c34c4f47b08dcb7b4bca/5384027983.pdfIn PDF document text
- http://agro-vostok.ru/userfiles/file/23471848133.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/591e6a9f2b9ce8bff437ef18168a95b4/sapagotuvixejagajugaj.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/sagufari.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d056e7930---suzibigakewowinavakijolu.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b08678199c8---jisurokigigekirigadu.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a109d45d9d9---51192853592.pdfIn PDF document text
- http://mysistermyfriendministries.org/clients/85776/File/talopawuxekumadadasogub.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0e1eee8cd4936565f9d0d80a8f5d709e/muxureluranase.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_off0000b539.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB539	11276 bytes
SHA-256: `4eb15a090502bab2c9c38dab6f205b6352e4090c5d2c85c170223bd95a672114`
`font_01_sfnt_off0000cfe5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFE5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e7f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7F7	14704 bytes
SHA-256: `1c17ae7a790d7fff6451925bc9098da31bb84f6e082fda9780e4e9a6ae4469c8`

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