PDF malware analysis — malicious · 2cbda2487aef166c

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 21:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4c52f505da15f402eafca9e2c80d8ffe SHA-1: 58e2203dd8c49987a6264e87b78236122a8be6d2 SHA-256: 2cbda2487aef166cb612a8b0752e33a762a7cc582526c78d61b47577eb05937e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and numerous links align with tactics used to obscure malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=answers+research+journal PDF link annotation
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611872bfd5a38---fizumolez.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/sarog.pdfIn PDF document text
- http://oilandgaswork.com/userfiles/file/kozakaposozow.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ub3fqnf01ovsjmapc09u9f937j/75051268357.pdfIn PDF document text
- https://brawlcall.com/ckfinder/userfiles/files/87859856320.pdfIn PDF document text
- http://vodnik48.ru/content/file/90080010249.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f401229c3---wakus.pdfIn PDF document text
- https://cleaner.pl/userfiles/file/62592330636.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b875e1d7234---dakokiwusekoduka.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff03278ed9---22927989655.pdfIn PDF document text
- http://madmojo.com/fckupload/file/duzerin.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021050915301973499.pdfIn PDF document text
- http://banlinhkienlaptop.com/userfiles/file/89260581323.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3f3h4e798eqggo5qme1o2jm4gg/50755721588.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e18faa886---vusabusumudonimodepaz.pdfIn PDF document text
- https://buka.ru/sadm_files/penekuberoratokowu.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ea7034687---58661744232.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64dc66e295---warukegutenonod.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7103c75fe813b5d50b788d2efb137224/lopobetunavuporalel.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc5df3ee6---88508351964.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107d80b5e48d---31408346882.pdfIn PDF document text
- http://eurolocal.info/sites/default/files/images/file/zezagikevorosijikufog.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6cn7mbvv6j1hucur8chkmd4qgh/43767882528.pdfIn PDF document text
- https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/87317396915.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9a65f22e521b3a044dfef946acf2343c/70085847381.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/jajenexujusorojiz.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_off0000df4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f765.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF765	10432 bytes
SHA-256: `68a81a4cd984a91f68bf5ec991f23d449dc5608ddc52f77ab32bbcb93707567d`
`font_02_sfnt_off00010f13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F13	18160 bytes
SHA-256: `97636d8a681463cda97db06ea9829a4aad7c222c3aecc9e5f68238547df2d533`

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