PDF malware analysis — malicious · 5ccf435a7131d04f

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 20:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 82a384fe40f4a4f0a752455e37083cd7 SHA-1: b59a97ab92101ee655b4deef9e9999332ae1669a SHA-256: 5ccf435a7131d04fe3b3baf3d2d059795bbf8d55236c370bb5eaf244d1b8ff10

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, but the primary attack pattern involves redirecting users through these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 5

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://nomylo.ru/uplcv?utm_term=generac+transfer+switch+manual+override PDF link annotation
- https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/f7da2801153921db5df2d73340675ef9/godobodetebiri.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160809e2544a46---gabose.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4ecd8f11fde15255bbc61aad38e90c99/kuwafifovefitifironav.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7960c3264c995e110e2409a9e1def5e3/22999268533.pdfIn PDF document text
- https://apotekatia.ba/fajlovi/nixakedanaraf.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/fufosijolidegejenavajuxo.pdfIn PDF document text
- http://didopack.com/files/31865300094.pdfIn PDF document text
- http://www.yoko-ono.be/images/userfiles/file/42668059963.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9d3b4586---widamavu.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6aa419852---lovorinumizomup.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bc5ce13142a879e087fac7e5c5514993/ruzolafuvenikegezesonib.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92805d734---56014080028.pdfIn PDF document text
- http://boek.se/bilder_umeny/File/38032480456.pdfIn PDF document text
- http://emke.hu/uploads/ckfinder/userfiles/files/geririma.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c929ea26c09---xetujegixoxisosesab.pdfIn PDF document text
- http://sameiroeventos.pt/ficheiros/7390521669.pdfIn PDF document text
- http://sochistandart.com/ckfinder/userfiles/files/nutixivorazusuze.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ntvichl5p45m1taisnadk4t0l0/jedigobowapilogut.pdfIn PDF document text
- https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20970e4d9ca17028d1638f57f2e1a8a/fepezazimamapokexureviw.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/82089f02613e7b9b23d896e409ae7dc6/97759890388.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608231874b0ae---jasirijo.pdfIn PDF document text
- http://clairvoyantinfotech.com/demo/images/jomugajabot.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_off0000d4b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4B1	11032 bytes
SHA-256: `7f0580d30ba051260f7e9817ec76cae951a215b1702dfe684fabd2e3e9ea0d6c`
`font_01_sfnt_off0000ee3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE3D	18116 bytes
SHA-256: `5000f6324469dff0f3723857cbb99fbd97604218959dbc1e2b739e043faf9f44`
`font_02_sfnt_off00011d8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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