PDF malware analysis — malicious · 3bd88f5bce41390b

MALICIOUS

PDF

74.7 KB Created: 2021-09-30 16:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 97efad3fa5b65f31641000f7d55d7cdb SHA-1: 2c09898c093c1d1997527fd7838024a04e9e057e SHA-256: 3bd88f5bce41390bbcfca61e6e131c37d1c9c8284b9ce3f11a34b5633e3dc4df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=granny+hairy+solo+tube PDF link annotation
- http://seksdagen.nl/userfiles/file/50932319169.pdfIn PDF document text
- http://surestegc.org/documentos/file/83418130738.pdfIn PDF document text
- http://www.pics4us.de/userfiles/file/budaz.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9639473dc117630becb0c5357fcbbac2/85089996511.pdfIn PDF document text
- http://texinpack.com/uploadfile/file///2021093000044692.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/db2ab743a1971f3e8c4a64e9e9d10b33/bavijut.pdfIn PDF document text
- https://hotelpancharatna.com/assets/userfiles/files/14103443929.pdfIn PDF document text
- https://resicolor.com/upload/files/39995289199.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d656efc40d9e81f829745371757de4b/19629006565.pdfIn PDF document text
- https://edarky.net/data/file/jasegomabewubeke.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408755be842---23191278477.pdfIn PDF document text
- https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/84616277296.pdfIn PDF document text
- http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/45344110979.pdfIn PDF document text
- https://casaalu.com/luutru/files/bugomevebujuvunijedebiwun.pdfIn PDF document text
- http://studiotecnicostradi.eu/userfiles/files/mobez.pdfIn PDF document text
- http://blackivy.pl/userfiles/file/13132368726.pdfIn PDF document text
- https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/78205655010.pdfIn PDF document text
- https://rosedreamholidayhomes.com/ckfinder/userfiles/files/33073860627.pdfIn PDF document text
- http://criollo-cocoa.com/userfiles/file/dovawu.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964fa4b9ed---jenutejawu.pdfIn PDF document text
- http://kondicionery-noginsk.ru/upload_picture/file/nunebavenop.pdfIn PDF document text
- https://tonere.shop/app/webroot/files/userfiles/files/kikomik.pdfIn PDF document text
- http://www.gamylai.vn/uploads/files/buvaleworixuvodagana.pdfIn PDF document text
- https://tebra.si/userfiles/file/puxajojudefuwudep.pdfIn PDF document text
- http://karaokejdi.com/ckfinder/core/connector/php/upload/files/rilusor.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210925_FA9D3575AEDBF7B4.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_off0000b80a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB80A	19476 bytes
SHA-256: `b445a3f5da152c97c4c4121d9ff39125d53de9e5e8c6ff9c773b9cf01a1b172c`
`font_01_sfnt_off0000eb09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB09	10600 bytes
SHA-256: `79a3904027a6971bb6e14d9b2ca14b148382363b145241ad8c30c43a1d156d59`
`font_02_sfnt_off0001033e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1033E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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