PDF malware analysis — malicious · 8e901e85b763256c

MALICIOUS

PDF

89.3 KB Created: 2021-09-22 23:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 2fffb76f68ddb30d25f7fbfb540568ee SHA-1: cdd0e000df82b4e21ca095445697304b8e706e24 SHA-256: 8e901e85b763256c779923e14575a53659d793aab8445e1d9097e8399b39114c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeffd4de4---ziwedirate.pdf In PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
- https://mimpidia2.com/contents/files/12783191688.pdfIn PDF document text
- http://tprcindia.com/ckeditor/ckfinder/userfiles/files/17889802648.pdfIn PDF document text
- http://www.colormotion.cz/UserFiles/file/96105215410.pdfIn PDF document text
- http://canavesiobruno-architetti.it/userfiles/files/tefajevibonowebagerob.pdfIn PDF document text
- http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/46417629773.pdfIn PDF document text
- https://serwisnawigacji.pl/userfiles/file/tubemaremononinarebi.pdfIn PDF document text
- https://agrocare.ro/ckfinder/userfiles/files/6143832660.pdfIn PDF document text
- http://volkshilfe-ktn.at/images/content/files/67339652834.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021090901101852.pdfIn PDF document text
- http://kaies.cn/upfiles/file/67824973185.pdfIn PDF document text
- http://membranekeyboard.pl/_data/file/58179989735.pdfIn PDF document text
- http://gmtshipping.com/attachment/file/1131713173.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/fatexu.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343254383f5---wumemakabem.pdfIn PDF document text
- https://dpengineerindia.com/admin/userfiles/file/sugoluwuwabenegu.pdfIn PDF document text
- http://magnumprint.ru/upload/files/xojixofuzowusaxusejume.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614034e3ca069---kabulavejapopovogiwexexu.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/79eef704a09255449ce925fccd79570c/34907499573.pdfIn PDF document text
- https://deesudcoolingtower.com/userfiles/file/79242265940.pdfIn PDF document text
- http://detskaoptika.cz/ckfinder/userfiles/files/dojijigef.pdfIn PDF document text
- http://9y.bfage.com/upload/files/20210921034842.pdfIn PDF document text
- http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cara+mengaktifkan+vpn+di+androidPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e52f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE52F	10816 bytes
SHA-256: `82b37da3d07e03c2cedec05c3ecc3bd6fcea58a42c63d6313271b2c48839cf4f`
`font_01_sfnt_off0000fdf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDF1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11603	16764 bytes
SHA-256: `97a0eb3bd335a1c348eb87e8e4eef5ce7f8851c4444cd1b1831a1b8a0cd994e6`
`font_03_sfnt_off000141b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141B6	16088 bytes
SHA-256: `0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf`

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