PDF malware analysis — malicious · b97c989135c8ffe9

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 06:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 39a3dbf635b73289a50787f584e05861 SHA-1: 3780afc435255e8b3e8310acc9d3e92f5dcf4229 SHA-256: b97c989135c8ffe980809221d2abc51121af3339ba397912acac6898c4b85cdb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript stream, while not directly analyzed for its payload, likely contributes to the malicious functionality by facilitating the redirection or download process.

Machine Learning

Nyx PDF Classifier malicious score 0.9940

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://batikatravels.com/userfiles/file/15026103605.pdf In PDF document text
- https://debden.org/userfiles/file/In PDF document text
- https://eownauto.com/uploadpic/files/20398218829.pdfIn PDF document text
- http://scsytech.com/upload/files/95228542116.pdfIn PDF document text
- http://ymmicro.com/files/files/xemopawetixaxudezetano.pdfIn PDF document text
- http://worldcar.jp/userfiles/files/6351525799.pdfIn PDF document text
- https://livre-art.com/ckfinder/userfiles/files/43640925181.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096ced3723---82778056200.pdfIn PDF document text
- http://metapolar.hu/tmp/98717534699.pdfIn PDF document text
- http://richardchong.com/userfiles/files/9755631776.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300940c929c---23019918327.pdfIn PDF document text
- https://euroialinsol.ro/userfiles/file/nuzadonolubuzinogataperid.pdfIn PDF document text
- http://zoscm.zohukum.com/ckfinder/userfiles/files/1120595433.pdfIn PDF document text
- http://trips-in.com/ckupload/files/mujarorosonibeju.pdfIn PDF document text
- http://nationalherbo.com/userfiles/file/mapeginumelebitusidex.pdfIn PDF document text
- http://shahgrp.com/uploads/92031103290.pdfIn PDF document text
- https://fetogram.ir/images/upload/files/tifotujamisetedarizewafi.pdfIn PDF document text
- https://www.htlexpress.com/ckfinder/userfiles/files/bovifuwamoxapor.pdfIn PDF document text
- http://transchem-tech.com/Uploadfiles/files/52767138208.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613508141674b---96403802958.pdfIn PDF document text
- http://kolaykanal.com/userfiles/files/lojogaripiwuw.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/22599699550.pdfIn PDF document text
- http://autoset66.ru/admin/ckfinder/userfiles/files/15828776788.pdfIn PDF document text
- http://drcleancenter.com/uploads/files/202109051119251409.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=naruto+senki+download+androidPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d87b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD87B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f08d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF08D	21044 bytes
SHA-256: `ed0aa4a403e8b50dfc16147a8364f187af17e34b1913a986564eea334ccb87bc`
`font_02_sfnt_off000125e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125E4	16228 bytes
SHA-256: `6d59ea6a2c2503b20eba28eedd5f6006d9cf05b22f5522dd9ea8a54092f6aecd`
`font_03_sfnt_off00013bc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BC9	10496 bytes
SHA-256: `3638a8b6a1d5b39d39bc2adc330b9f4a6f3766b7688ada04c33cea88be760d59`

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