PDF malware analysis — malicious · 91d25d80bf4b775b

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 02:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 0949ea3bea8111874496166ce816daaf SHA-1: d9b43332ade9faa52fb2a8be8694a6e4c1c9b646 SHA-256: 91d25d80bf4b775b06eaae94220e14d0884ee91605d2cdf0b99197c5adbb924b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and 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, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://smartickgroup.com/userfiles/1565035580.pdf In PDF document text
- https://altonika.pro/files/fck/file/98603101823.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4de4c83d1d26de506e00e42e93fc6b9c/gugaduvujuwa.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/os2d2rj2jso4hlvr4u991f3168/22657129947.pdfIn PDF document text
- http://computer-rudolstadt.de/upload/file/dufabizudikaroziga.pdfIn PDF document text
- https://tidymoney.com/ckfinder/userfiles/files/43501431710.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/17473757116.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74883c29d8---xijofununi.pdfIn PDF document text
- https://samavetah.com/ckfinder/userfiles/files/toviwarisepipajo.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738a23ea571---27222162139.pdfIn PDF document text
- http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/716995288.pdfIn PDF document text
- http://bursaceyizgelinlik.com/images_upload/files/27474302882.pdfIn PDF document text
- https://www.dars.bg/ckfinder/userfiles/files/70680252193.pdfIn PDF document text
- http://grandp.ru/userfiles/file/rasafalotibiradatuj.pdfIn PDF document text
- http://ylplj.com/ckfinder/userfiles/files/27277486451.pdfIn PDF document text
- http://banghetretruc.com/media/ftp/file/wawedalakofulola.pdfIn PDF document text
- http://elma1.ru/!upload/files/fusofonukur.pdfIn PDF document text
- https://autotronics.vn/userfiles/file/silul.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/takizinexukemowepesu.pdfIn PDF document text
- http://elosc.com/upFile/file///ITX202107212204489156.pdfIn PDF document text
- http://garankuccu.com/upload/fckimagesfile/e1ff35ba488925c58fa60d88f2e17fe5.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/xobejeravurer.pdfIn PDF document text
- https://ldcpc.com/ckfinder/userfiles/files/78055380351.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8ab7002eb58bde1696b3f95415f5b44e/33166640825.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reproduccion+asistida+libro+pdfPDF 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_off0000db22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB22	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f339.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF339	10900 bytes
SHA-256: `130dae045e0157ef635c07806cd9477dd4be7eb21d522c27c64b83c7ed2c71dc`
`font_02_sfnt_off00010c53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C53	19740 bytes
SHA-256: `2ca92ce604e4c1ba278c547f58883e9bbf6de6f6388e01acff00e066ee4e7715`

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