PDF malware analysis — malicious · 8b2b88afca3f2af6

MALICIOUS

PDF

82.3 KB Created: 2021-07-23 10:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 624ee2a647c05b1bd43db6f244a14273 SHA-1: f8ff18a482bbe4b3fb66417444911714b719c856 SHA-256: 8b2b88afca3f2af68ae59b935a4a5fef362a871f81fddead214cf652f65fd05c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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://szaniterplaza.hu/ckfinder/userfiles/files/54782505315.pdf In PDF document text
- https://louvre.lv/res/wysiwyg/file/60013088875.pdfIn PDF document text
- http://whuntex.ru/userfiles/file/80087508421.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/kozagibexelofogifizoja.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b42fc65d0---kipukilotozopetowiloriv.pdfIn PDF document text
- http://strategie-online.net/catalogue_dynamique/file/sivararomorejekodo.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825d399907---34377520107.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/48427279e9760268a3daad21ef202388/zadolupitavexukufebujozo.pdfIn PDF document text
- https://gulyaskantin.hu/uploads/frontend/files/71148126997.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8c6p3e410f5nijk1lhc8ogams4/57659573550.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/rebemorakom.pdfIn PDF document text
- http://phutungtdc.com/upload/files/34534532435.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e0cb96b8d1d00134e55b2630d6a94a91/37866706166.pdfIn PDF document text
- https://styliststudios.com/imagesTE/file/sewazolososopade.pdfIn PDF document text
- https://kede.org/userfiles/file/25969020633.pdfIn PDF document text
- https://equantumconsulting.com/files/files/ledatoxisigasufuluroferu.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9glm9b0e14gvg9kl4hlo1rbab2/9550250641.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/46f6200e83ce3cac95643b764a803157/7544658777.pdfIn PDF document text
- http://kaitosushisb.com/uploads/files/28988179211.pdfIn PDF document text
- http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/91909596226.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75f246bf8---99857126888.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/l037548209jdfotv1mjd29ilte/piwofisowo.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8db96e734---12458224180.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6525c211---sinarevodux.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160862d3ca77c3---37954856969.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1+lb+ribeye+nutrition+factsPDF 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_off0000ddfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDFA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f611.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF611	10636 bytes
SHA-256: `44d8391e985b843644d83c4ecdd89f55a3aa8c810e185dec17bde504edd3e7d4`
`font_02_sfnt_off00010e93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E93	16872 bytes
SHA-256: `71d2dbd3530d4ab12637d5e7a861f0f2f22ca5f86e984a1711cf399b904b45bb`

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