PDF malware analysis — malicious · 83f77a098b52f5a9

MALICIOUS

PDF

76.8 KB Created: 2021-08-28 03:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d06c8810d0fba1c3867c77dff5565188 SHA-1: 4739f246cf1d73dd633eb3a6b04e0386022dd493 SHA-256: 83f77a098b52f5a96eff7a6e626a54c2c262e73faf6cf2df168ff2a6846acdae

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=commercial+transactions+pdf PDF link annotation
- https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/rasoxivo.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/95096690b5fc7fde0ae76334ae8bbc4b/xagefutowegefuxunep.pdfIn PDF document text
- https://ctners.com/ckfinder/userfiles/files/18185022685.pdfIn PDF document text
- https://limberhurstgallery.com/imageuploads/file/remipirafadoni.pdfIn PDF document text
- https://mimpishio1.com/contents//files/73000193377.pdfIn PDF document text
- https://anakmeong.com/contents//files/47219458196.pdfIn PDF document text
- http://brianhaymore.com/images/e/file/lozomogoxemanukuzizux.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/64492385180.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/347a0a91b778241a7e2f0196bdaef803/nivajisaxamutit.pdfIn PDF document text
- http://hayatteknoloji.com/webimage/file/62016324079.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d99d78da---merowesikosoxasafepel.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a235c18fb0c---juzozarodesivajopunalitat.pdfIn PDF document text
- http://dailymaytrogiang.com/userfiles/files/8566574938.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e1befad3---1610996167.pdfIn PDF document text
- https://sapporopools.com/contents/files/29106672305.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19c2eb72ed45bc90d23c9803dbe81f07/sozabexun.pdfIn PDF document text
- https://foodexgida.com/uploads/files/lawugatinoj.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d6fbe51744712311762adca6d1a7452b/42366791051.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fdca94710a2c9162238bd16b87b6609d/95944056160.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91011ec98---6830706642.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/faduv.pdfIn PDF document text
- http://kasargod.net/uploads/file/tomovixavipenojop.pdfIn PDF document text
- http://bunny888.com/ckfinder/userfiles/files/laniwedoj.pdfIn PDF document text
- http://atthaya.com/file_media/file_image/file/93280233705.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53398166148.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_off0000c75d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC75D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF74	10812 bytes
SHA-256: `ecfa7c33c1ea2034b0b01bb5cdc0e17b28d6d1625be540c89d3056cd00624da4`
`font_02_sfnt_off0000f85a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85A	17140 bytes
SHA-256: `ad74d3cf4f505e7597f68af3264fff79d3acf5bd180b1c8ab212af6241325a19`

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