PDF malware analysis — malicious · ece92494f7a7b948

MALICIOUS

PDF

75.8 KB Created: 2021-07-08 03:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 1251a1ec3f2108f53cb51c3164a2688c SHA-1: 6d75ae211850269c9f4717fb6dbc8e8973760d25 SHA-256: ece92494f7a7b9481a43751cda0bb5d7c7d56a6b78e47214d43ce3950390b813

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest these links are used for SEO manipulation and point to compromised WordPress uploads, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=derivative+of+sin+inverse+root+x PDF link annotation
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608648bc46a91---29515238697.pdfIn PDF document text
- http://slstudio.it/userfiles/files/88495651394.pdfIn PDF document text
- http://didopack.com/files/34186762857.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/84f57e01f10623b1ef54a1e74e7c3c3b/34483284774.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/00e1c6329964bb9a954516b5fe528a9d/61385945088.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/de59e6dd905c0f9d23ddf7e2fb6357a5/zekamalebiwodoregokakupob.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54619013b---junukipaguzadinibojax.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b2ce611d3edc9b670aab97db0208b114/koragazopizan.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i7ts1n68f0s97ouees2rh58pr2/jafupiverasowipajuzew.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9799f5e6---75869831647.pdfIn PDF document text
- http://texmet.pl/userimages/file/27798928305.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfae1ecba02---tukapepugisawefofagu.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/17471706851.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b30c90fef---fenedunijuzojumano.pdfIn PDF document text
- http://acecaalcoy.com/userfiles/file/gutetamoxezebuwu.pdfIn PDF document text
- http://limoride.net/gallery/file/zomisoxopetazapiwejuk.pdfIn PDF document text
- http://hondatayho.top/img-ngocbao/files/31780626837.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae1cc46371---8706824674.pdfIn PDF document text
- http://pagyesa.org/userfiles/file/20210608141714.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/jokuzozugimajojidivajavu.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097088f7400f---22270358081.pdfIn PDF document text
- http://tasarimak.com/ckfinder/userfiles/files/17253203429.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22c575bb3c---webegekule.pdfIn PDF document text
- https://songhong.info/userfiles/file/49743832789.pdfIn PDF document text
- http://oldtimerclub-thueringerberg.at/images/file/neduwexomedemuzixi.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/44569feb76cb68850924c75a43800ab2/89002833173.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_off0000c6a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6A3	10332 bytes
SHA-256: `6162bb07c80b93a4662d31bd2fe59f3f08cf5e2877681d955ed6d5c8fff9111f`
`font_01_sfnt_off0000de27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE27	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f639.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF639	16588 bytes
SHA-256: `1d7f3b43c21e2e801086daac2b0c47e3827b72d136f5fb378c89c8dec34509d7`

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