PDF malware analysis — malicious · d153bb4385a55e8b

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 06:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 43f00a68c5f7e88718b32a18451e0d7b SHA-1: c2e65ce2c42e02731f7d2b9caeda31d21dde0a25 SHA-256: d153bb4385a55e8b1b262ffe7f806fffe35e676edae153e36d1dc9db5d7ef354

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is intended to lure users to malicious sites, likely via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=pdf+compressor+online+200mb PDF link annotation
- https://alutat.com/data/file/87273203693.pdfIn PDF document text
- http://ayurveda-shiatsu-qigong-nice.com/upload/files/moketemeduramodutadivibo.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdd623810---39377731417.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a0be0f70fcc69f797a6463a3e28f0154/wegiwabiluxaje.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/68859551976.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bput0f62ok4ebolv5eetjnaoqr/fibulozusojud.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e295f139e4cd9308464a12c35a21fc9/3475191970.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea3737154d---bafikularod.pdfIn PDF document text
- https://karapinarinsaat.net/userfiles/upload/file/kevizigobubomivudapeg.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc15b0315ee---31890428785.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ae2320066d151810c295b44fa067fc83/92352078980.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a8f23d6c9dcbdb10bc06b0238013cfa/65036615638.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/76d7cf66f9cfe0bbf9422d844a0cc87c/wubudose.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/81335305148.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2ea9a9e4---24125467789.pdfIn PDF document text
- http://sinproval.it/userfiles/files/5462121668.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/20217181143571306.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081be0d303b6---98447770266.pdfIn PDF document text
- https://banerjeetourspecial.in/ckfinder/userfiles/files/penusomugufutolomurowok.pdfIn PDF document text
- https://asztromiskolc.hu/ckfinder/userfiles/files/bisodojafaposu.pdfIn PDF document text
- https://clubforeducation.com/FCKeditor/userfiles/file/59211515863.pdfIn PDF document text
- https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/97edfbf1f896cf65d13cc5e8dcfeb4ee/84851629824.pdfIn PDF document text
- http://soc-in.com/data/media/files/9183996555.pdfIn PDF document text
- http://opuspointpartners.com/ckfinder/userfiles/files/56374483597.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c98bf06cb---34674613934.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3fd4541fa7930552db6a9a560188a32f/18250076401.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_off0000dcc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCC9	10904 bytes
SHA-256: `62784840e2eaeb67c82ae2700a0bc0b1538e7e96f9c335f190f46d7cdc9f0f77`
`font_01_sfnt_off0000f5b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B4	17560 bytes
SHA-256: `ea85108c577e3650bf506b278195e4da133fe425b742669abd64e795374c7d4e`
`font_02_sfnt_off00012340.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12340	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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