PDF malware analysis — malicious · 21f1f2d425d4e08d

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 08:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: e61fa617ef718c647cf69c5231994732 SHA-1: da606eab7f8ca1e2c25fed910b26ec7d9e3c15fd SHA-256: 21f1f2d425d4e08ddbcc4b1d5e2340698933ea0bde3c545b6e86739285c357a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/db1e3c9cef53e0d2df33b7f094ac139a/43640065932.pdf In PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ko9jrr9qqs5vb78agh93m64b8v/46265695197.pdfIn PDF document text
- http://gabortech.com/admin/file/wetaxufod.pdfIn PDF document text
- http://skncn.com/u/files/nuzagijotaralilejefe.pdfIn PDF document text
- http://lumieretvie.com/userfiles/file/91486166103.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6a2d867244677924228c2745ffce35c5/40953031685.pdfIn PDF document text
- http://security-m.jp/tool/images/file/3861562336.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adec99c47db---25557271470.pdfIn PDF document text
- https://naoshima-habitant.com/dijilagagagupi.pdfIn PDF document text
- http://entryexpress.online/chapter_images/files/zeximepusokulidijawez.pdfIn PDF document text
- http://bright-mineral.com/uploadfile/file/2021061113584873.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/88841054035.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/o7thg376l8dibbmkmo7isccr7k/murawutasafuzukudu.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94d7c39b0a---fazivobo.pdfIn PDF document text
- https://oicenglish.com/imagexx/files/xalugep.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/840df2cbff71bfff0b247175d88ec0af/wajevivuvalisi.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/655cnvk9s1r6j7taumlnsnko6i/wivigugutabikiwizot.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7e0d6bd54ffbc060846ef49fd8b7c8bb/xurupekuwewidumorasebo.pdfIn PDF document text
- https://torbay.ru/images/uploads/file/lemoxerobupineg.pdfIn PDF document text
- http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a11046255cf---55505007080.pdfIn PDF document text
- http://savitapiti.org/ckfinder/userfiles/files/63043787984.pdfIn PDF document text
- https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2bcb808a24deeb361d301a261cbecc55/xiker.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080141c0cee5---susonixogetezugakibuvit.pdfIn PDF document text
- http://amadpich.com/userfiles/file/8992268097.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8b0c3365a7dda4ea529db0eff5e6a89c/56707774105.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+little+red+riding+hoodPDF 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_off0000fddb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDDB	17512 bytes
SHA-256: `e8afe7bb0e26238dde68138dfe4e4f24f2a896d8da30d374da50a74096e01486`
`font_01_sfnt_off00012b8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B8B	10260 bytes
SHA-256: `e50dcec4fe0da6fbc915adc7ba9a94896d925c9b34b668d1ffc0e17c381e21b7`
`font_02_sfnt_off00014251.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14251	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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