PDF malware analysis — malicious · 37419ef4a3e42a10

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 00:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 29fb3de8f06bd9d7501039e608275c2f SHA-1: 67232868ba8b1481419b87bd1bf889f318a17cc4 SHA-256: 37419ef4a3e42a10694301058614b47d4aa8d3c100feb6d13b4d57894fd941df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nomylo.ru/uplcv?utm_term=bread+crumbs+for+tomato+soup PDF link annotation
- https://fceresources.com/ckfinder/userfiles/files/rejixaxokumosoxukomigo.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/82623514631.pdfIn PDF document text
- http://lctrading-gmbh.com/ckfinder/userfiles/files/digodebivugujomufetogotop.pdfIn PDF document text
- http://auto-rad.pl/userfiles/file/24942032135.pdfIn PDF document text
- http://prttour.ca/FileData/ckfinder/files/20210905_3096BF8B5D3583C6.pdfIn PDF document text
- http://china-spec.ru/userfiles/file/valegijiw.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a325e0bb5---jenomuf.pdfIn PDF document text
- https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/wuworukuwepomefi.pdfIn PDF document text
- http://thaihotelsale.com/FileData/ckfinder/files/20210918_E78A66344B2F9F6C.pdfIn PDF document text
- http://sd-bada.yupucx.com/upFile/file///ITX202110010147048300.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/69623301565.pdfIn PDF document text
- http://alrabbancapital.com/file/files/3566848793.pdfIn PDF document text
- http://zzquansu.cn/d/files/zekekolap.pdfIn PDF document text
- https://babamansurkurhuseyin.com/uni/yuklemeler/file/48735224767.pdfIn PDF document text
- http://aviteksural.ru/admin/ckfinder/userfiles/files/luvozolukelopo.pdfIn PDF document text
- https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/pavarorefididaxezela.pdfIn PDF document text
- https://biomedchita.ru/imeg_master/file/tatino.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb320a059---55694209849.pdfIn PDF document text
- https://studiecarriere.it/uploads/file/13134862736.pdfIn PDF document text
- http://sz-nuoyi.com/Upload/file/2021091202101890881.pdfIn PDF document text
- https://saikekanglun.com/filespath/files/20210921191208.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615383c90e3b9---bilumaselizesirew.pdfIn PDF document text
- http://bamboomfi.com/htdocs/cljr/data/files/92434755254.pdfIn PDF document text
- https://cancelaria.pl/galeria/file/29556058773.pdfIn PDF document text
- https://clinicamanila.com/ckfinder/userfiles/files/48665655032.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_off0000b468.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB468	10832 bytes
SHA-256: `b16d48a3a864209d47a55276dce0deb3849a4e4e208f8564bdc004efb514b649`
`font_01_sfnt_off0000cd42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e554.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE554	18620 bytes
SHA-256: `9325869a0cb986b9fe1656805df2e1758d04e906cded57af9c2d7eacdb663a57`

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