PDF malware analysis — malicious · b0d8a9d51c43c6b1

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 18:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3674d19aa46329b9d74a17de853cb429 SHA-1: 22ea8e6c44c60c0ed8099fdba552e0a6c9e337ba SHA-256: b0d8a9d51c43c6b1cd73af6d088b1ab7614c96e63f9a0c55ff56f4bb3ee8ba95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=reinforced+concrete+mathalino+pdf PDF link annotation
- http://amandamaitland.com/images/file/jowud.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r80ourhjmcpgktbqtbdh3olub4/janoralubotegobejeveg.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14fccc0336---bevajojomukewitamexawa.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d3d2d36b---ximufi.pdfIn PDF document text
- http://iburgisidimarsala.eu/userfiles/files/nodetovosifa.pdfIn PDF document text
- https://bdblue.com/ckfinder/userfiles/files/8846230298.pdfIn PDF document text
- http://ptaki.info/imgekoprojekty/files/93166636220.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b21b2313c949f12731cc4a16d05c8cad/29516786951.pdfIn PDF document text
- http://kochamsushi.pl/UserFiles/file/9197013081.pdfIn PDF document text
- https://damsindia.org/admin/uploads/file/tizopasanuvudeguvepopuk.pdfIn PDF document text
- https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/45a5c947eda2a2bedf8a90d62faabee2/mifokovazikol.pdfIn PDF document text
- http://cdkkck.com/uploadfile/file/20210731210125.pdfIn PDF document text
- https://bruceautoservice.com/files/file/96786914065.pdfIn PDF document text
- http://dharmapremipariwar.org/userfiles/file/xowituroxaxemij.pdfIn PDF document text
- http://sugarfree-gelato.com/upload/file/58444257179.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/74919970836.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eee84ffb5---47626991473.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8fbf2f6725caff1174f3e97c0be1ecdb/sevupatetol.pdfIn PDF document text
- https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/3a3caef0ca888638d47a810bcbff084c/favoxuxikadusodisiwusef.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161117221e4092---bivofisesorofonaj.pdfIn PDF document text
- http://carrozzeriabosini.net/userfiles/files/tumanus.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/32053955931.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/71920825409.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/9390107498.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da45123543---xiwaxedusab.pdfIn PDF document text
- http://candientu24h.vn/webroot/img/files/15129826215.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_off0000ca8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA8F	18660 bytes
SHA-256: `9414543128453fc40f56b96fad45446f00e21588c5df8119dedd53f8d9527247`
`font_01_sfnt_off0000fb0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011325.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11325	10760 bytes
SHA-256: `6b1f95d2eaffa31c2f70969f170819db719a7187358da25ce94f994b58d1dc8e`

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