PDF malware analysis — malicious · afc781d3f5285a96

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 06:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 507562dd187e47ece0284874a709f150 SHA-1: 2d59ca333dc195825660755d1dc5fba35671b593 SHA-256: afc781d3f5285a96ab946c0e7678c3105cc82bed14aeba71442af501c7eac5f3

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9788

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://xn--oy2b19v1mb1yi.com/userfiles/file/15893559149.pdf In PDF document text
- https://cakenflowersonline.com/userfiles/file/nuzewa.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe5a0c85a---963344403.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1cc22b67---67222888720.pdfIn PDF document text
- http://togclick.com/media/userFckfiles/file/47220082650.pdfIn PDF document text
- https://eingangrad.ch/userfiles/files/71067658782.pdfIn PDF document text
- https://digireg.ru/upload/kixezoxubagudawim.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380baad63c9---35748593366.pdfIn PDF document text
- http://snieznik.pl/userfiles/file/zezigolimositaxakevodo.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec0f9e3ed---miwomosapabi.pdfIn PDF document text
- http://villaroyalenews.com/userimages/rirumebudebovusugurerab.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/75437130592.pdfIn PDF document text
- https://shiprapublication.com/uniformkontakt/userfiles/image/files/80870093690.pdfIn PDF document text
- http://glampingcaravan.com/userfiles/file/20210914170804.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b7352f491eb937821255a70c0fb84fd/navexaxopakinen.pdfIn PDF document text
- https://blv.by/upload/editor/files/guriveverunir.pdfIn PDF document text
- http://dakov.hu/_user/file/52751749233.pdfIn PDF document text
- https://ph2020.org/ckfinder/userfiles/files/3120798971.pdfIn PDF document text
- https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/2612470589.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/poluremijibetezuxutetemom.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/76509063643.pdfIn PDF document text
- https://interstudy.net/userfiles/file/85524060972.pdfIn PDF document text
- https://carlojans.com/cms/file/mosulivuja.pdfIn PDF document text
- https://gsm.company/ckfinder/userfiles/files/4496021213.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a0be0365---77766977815.pdfIn PDF document text
- http://www.horakgolf.cz/ckfinder/userfiles/files/9998779257.pdfIn PDF document text
- http://ge-mak.com/files/nemevoponilivosezogatil.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+episode+43PDF 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_off0000b6f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6F0	16348 bytes
SHA-256: `7d9e18774d7ef079e29216e183dee4772ec9c85d29a7465ac912d508f04d8666`
`font_01_sfnt_off0000cd5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD5D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e56f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE56F	15264 bytes
SHA-256: `d24d54ab5639987fccf28242aebcb8882fb9afcd5afeb2342b99a9471b6b71e5`
`font_03_sfnt_off00010b0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B0D	10920 bytes
SHA-256: `36b0f8c5554a78ecd7b28f87f2c68ff1a71ef863d37b8cf4dc0477ce2b85627e`

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