PDF malware analysis — malicious · 83dad2150fffbc41

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 18:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f48c4eb21a05b76e3d58ee5d75638368 SHA-1: 7a5039fe7afec26ad62f66f186629065553058f5 SHA-256: 83dad2150fffbc41ec16aceeea9144605c7cfeb9bcbf27567bea1c7d51ea9e16

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://pixomot.ru/uplcv?utm_term=kingdom+rush+origins+heroes+unlocked+apk PDF link annotation
- http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020803323541.pdfIn PDF document text
- http://bastola.org/userfiles/file/97794658198.pdfIn PDF document text
- http://1-cities.com/blog_images/blog_/file/rajitidiburamag.pdfIn PDF document text
- http://phukiendoxe.com/media/ftp/file/2941566178.pdfIn PDF document text
- https://bostaninsaat.com/image/files/nunasagotinimoxodivomur.pdfIn PDF document text
- http://micruts.org/userfiles/file/68404702319.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/vupibajupuruzegodariw.pdfIn PDF document text
- https://la-klamm.org/Files/files/buzedexadosebufota.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
- http://gyermekhaz.hu/Content/site_images/files/ziterajetawu.pdfIn PDF document text
- http://stlukesfp.org/ckfinder/userfiles/files/zevojamefulol.pdfIn PDF document text
- https://abouelhoulgroup.com/userfiles/files/kosobofakuzopibuguli.pdfIn PDF document text
- https://holcom-wd.holcom.vn/webroot/img/files/32288253048.pdfIn PDF document text
- http://homesunshinepharma.com/upload/files/10465222158.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9e159e3cf1b58358b99eb9ba1f6d3453/navezug.pdfIn PDF document text
- https://nyirfa.hu/uploads/files/28699896027.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/39e919d5d4ae756a3d4e84ad88877307/69331848313.pdfIn PDF document text
- https://www.l-games.jp/js/ckfinder/userfiles/files/35381413797.pdfIn PDF document text
- https://theurbanthinktank.com/files/56378638576.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/zamaxozixesekuk.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e323504a---xewanen.pdfIn PDF document text
- https://ferest.ro/imagini_ws/sofefumezelotukavo.pdfIn PDF document text
- http://www.hgbehringer.de/img/files/files/fanujagaw.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC0E	11044 bytes
SHA-256: `6a86eb28c62bfae47bf7717101844430829c2a9527690114b63e769c2f1bd327`
`font_01_sfnt_off0000f54a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF54A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D5C	23452 bytes
SHA-256: `e386965403592e5bff3dc6e62b409b990c88a260383683fb07a10d97ae578e8f`
`font_03_sfnt_off000148b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148B9	1820 bytes
SHA-256: `ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c`

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