PDF malware analysis — malicious · 40caf45871e992dc

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 09:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b9d2bfb4612b8816b4aeda8323cc150c SHA-1: 0efc1df8ad946b47a8480fabb5be516adb3c1c2e SHA-256: 40caf45871e992dcd00b74c62e93bfbb4d98d903397b3b81812e536ae63f8bbf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://okmarin.ru/userfiles/file/92957758145.pdf In PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43a10357c---82544916739.pdfIn PDF document text
- http://vieclamquantri.net/upload/files/fuxutibetod.pdfIn PDF document text
- https://2acontractor.it/images/file/93501153340.pdfIn PDF document text
- https://transit-connection.com/userfiles/files/94921590554.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849379d088d---2374755528.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/31387255632.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6f29c3d3507c2570375105c463bad45/46673556316.pdfIn PDF document text
- http://grapevinewinerytrail.com/clients/876125/File/wutevuterosaxibadarewi.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/40081f0dbdefe1a4000274a22942cdc7/nifopasuzidape.pdfIn PDF document text
- https://bbgpiti.com/userfiles/files/61590806079.pdfIn PDF document text
- https://dobre-akce.cz/media/files/file/95441856803.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b014bc57a71763a1a9d8905a7bfdae65/66494192012.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee0634ef3---wafuse.pdfIn PDF document text
- http://tragiaocolamsapa.com/userfiles/image/file/18592955885.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c24524006af---tefageta.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc2ec9c7b---18063176624.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f005b0cc---85352093964.pdfIn PDF document text
- http://b-solutions.net/userfiles/file/natirapume.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/632300c05164cdf219704e8f3265a290/59995345621.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/57fb0819d060295d9326d3e7147f34c3/piwawemebolexebeguxu.pdfIn PDF document text
- http://taeguektour.com/FileData/ckfinder/files/20210712_2051F64803AE9195.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1e575c12---viwujapegonijuwesu.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f615d15aab---wasamoxonibivawawumowaka.pdfIn PDF document text
- http://didocrosby.com/imagenes/file/naruxewojako.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/incu5ncb304qqdgn82cj06ij58/vigolubesezupeni.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=learn+to+fly+in+pandariaPDF link annotation
- 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_off0000eb9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB9B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000103b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103B2	10392 bytes
SHA-256: `abdb6e278606b1a22dffca003731a33e212101511818d7f3cc2f56de91320328`
`font_02_sfnt_off00011b49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B49	17568 bytes
SHA-256: `00ddab2e08f779db48eb82a75174ded3fcf8c75729f0546fb319b6fb47f81dd0`

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