PDF malware analysis — malicious · 25c9cc00960e2edf

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 05:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4fc81ac995596180b3f05420c76b9f92 SHA-1: 447e49f8661526851633e84bcf5b82efc195be27 SHA-256: 25c9cc00960e2edfc1472249a513ac83226eaa10ad713aea7b72aed3f09c78e1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 7

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.
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 http://sushigonewildtogo.com/uploads/files/92063130784.pdf In PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec510eabaa---19140202491.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ph4iu2a82bgf2i9k243qfhn154/nutewagemilimefananabaxi.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/xaturubuvogidox.pdfIn PDF document text
- http://salespate.com/userfiles/file/sawemi.pdfIn PDF document text
- http://www.psyforyou.nl/upload/fckeditor/file/kifaji.pdfIn PDF document text
- http://baikalspring.ru/ckfinder/userfiles/files/73789312387.pdfIn PDF document text
- http://shiraz.sk/ckfinder/userfiles/files/8199236756.pdfIn PDF document text
- http://peneleos.pl/userfiles/file/zenemokopufala.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6e086c6f---37581966786.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d5ddde9bbdce7f875bb73f3f01ad3d39/sezeweleb.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d108b962d520b4cb51efd15496dd4d38/45867779375.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7e8b8bf6c85c0639c522ba0d632a6d5c/dodosiju.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d008d8235bc---4311683183.pdfIn PDF document text
- https://esz.jp/img/editor/files/21785619929.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/j5i12sfh3kep5lv94np91fpr30/rezenafada.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608452e926c46---lirabimamuketulelibusonet.pdfIn PDF document text
- https://heritagecambodiatravel.com/userfiles/file/muxerobaxexixufodowosaso.pdfIn PDF document text
- http://aliglobshop.com/userfiles/file/57453458511.pdfIn PDF document text
- http://marleenjansen.nl/images/uploadfiles/kuzinegigiforonifadepom.pdfIn PDF document text
- https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/zibefaxifabazi.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a9137620d53037ffc941a1bbc397e78f/befebakabuwezeja.pdfIn PDF document text
- http://kezmosas.hu/files/file/kunavidifo.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f57aa550---28011829528.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff820ddb972---33101318650.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=new+york+philharmonic+trumpet+sectionPDF 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_off0000e5a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A8	18572 bytes
SHA-256: `8082280117afc13eb0b80360b8446f670cc55861069fe9187451ecb4aea2fed4`
`font_01_sfnt_off00011688.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11688	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E9F	11008 bytes
SHA-256: `383da483eb209cc81b3766bde42ae2b4ef9e93f264ba598cb50efd779203342d`

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