PDF malware analysis — malicious · a7db944877b18c0c

MALICIOUS

PDF

93.0 KB Created: 2021-08-08 17:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 90d246c6cf4ccdd1cc69428335e2fca7 SHA-1: 5ee9a7c35695c511879c6efef5c4490d4323db1c SHA-256: a7db944877b18c0ce73bc52bc51e2c74fe448416b60a2fcd85537d903c9b8beb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be to redirect users to malicious content, likely for phishing or malware distribution, leveraging techniques such as spearphishing attachments and potentially embedded JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=juno+pelicula+completa+en+espa%C3%B1ol+latino+youtube PDF link annotation
- http://mextro.de/upload/files/75687509868.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1131b260---83399532028.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lhke92d4opgbb6dpeqk9766rmn/ratebuxof.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/30657465757.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830144b96f2---pepafasugez.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5077e5c5a4---xumizewejutezegatuxom.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fa5a2c66eea9c270e77f924a4377ec5/dumozesevos.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce5b10d09---95593742836.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/65033877115.pdfIn PDF document text
- https://bearings.vn/images/ckeditor/files/jaturulepid.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaaf6c51e7---tipavibesasiwomezamavop.pdfIn PDF document text
- https://seedomoretravel.com/files/files/17801798780.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/86986ad98156f2c60db105df7ac07d04/85141138146.pdfIn PDF document text
- http://vrieshorst.nl/images/uploads/file/barofoderotufegonosezagor.pdfIn PDF document text
- http://daivupaint.com/img-chamthi/files/rebuv.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609f066852153---geveb.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6c68f953bf78df14fe2659ca6c8d2358/43508368356.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d34c388eafe---sogosunujabikeguziwive.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32f57c4fa---11919274818.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/46174984235.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2m0v4fv4v7a1bad7pucp7dtnhr/biwopetaze.pdfIn PDF document text
- http://foodchemsino.com/d/files/ledinasapivove.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bao64ku47tapvj6bo2u3d2l5dn/70039899626.pdfIn PDF document text
- http://interreg-ipa-husrb.com/downloads/vogarivurekid.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8EE	19060 bytes
SHA-256: `261bea6dd8f5c352f6362c7c5c9d98de3729838830fdb70d4e870ada93e9d2fc`
`font_01_sfnt_off00011a7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13296	10988 bytes
SHA-256: `345b2625bbf867fe08a31fc3c40360e601f20d08912e5a506cc9461df61f75ce`
`font_03_sfnt_off00014bb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BB0	16344 bytes
SHA-256: `119de67c69ee1cd2f7f6a4ad8028eb5cb1adab23342f4ee92ae2af8f183d5d10`

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