PDF malware analysis — malicious · e8e9696f358afe24

MALICIOUS

PDF

111.2 KB Created: 2021-08-25 14:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 315e31aa7993c3681ad1fc4692b8e0d0 SHA-1: 627e817e5b3ee0197b24db399c4456b412ebd384 SHA-256: e8e9696f358afe24450eb3b1822f85d20c532d1e1d0744b4e495a7f210cd99e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings clearly show the intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9896

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 http://vksraja.in/fckeditor/upload/file/funovulotelitaverofojezun.pdf In PDF document text
- https://netshopnepal.com/userfiles/file/98687092063.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/43237460501.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9uu9korrvvurr97rsajir8lkd5/83507479699.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/15353887881.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf312cf7dd---9862653349.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c55483ee---62091314566.pdfIn PDF document text
- http://bclgrouptt.com/userfiles/file/nepuwenudomevisawajog.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9221e9b04c---gevuwokezu.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d375eaa8dd5---pofibekewamizisujuzam.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c7f2206a2---76955647282.pdfIn PDF document text
- http://granitemountainranch.net/userimages/49541618555.pdfIn PDF document text
- http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/rugilipufisagipetetawu.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f847372084---burevitusipisub.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/aol8tq6r8715oh4hlisvcn3r50/wimavomoruwuburobazaza.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ce7b74c1a---16367489835.pdfIn PDF document text
- http://studiolauramoschini.it/userfiles/files/76619148032.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82bb48c85a7b3da1abed1b59957a2824/dadunonajixudole.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1622464014.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7b4d1b09---62182959723.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a70c892232321ccb0d2aa8cd20d74cba/82440515155.pdfIn PDF document text
- http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
- http://feuerwehr-mittenwalde.de/mediathek/files/mokadibijafa.pdfIn PDF document text
- https://hopclickhospitality.com/scgtest/team-explore/uploads/files/2483980706.pdfIn PDF document text
- http://w-f-l.de/user_img/file/17716007730.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/fafuragovor.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=causes+of+secondary+aldosteronismPDF 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_off00014b37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B37	18648 bytes
SHA-256: `3961670c406b934cffb13cf9adba38024a6ecfb9df34f779c240fe3fa984b919`
`font_01_sfnt_off00017acb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17ACB	10884 bytes
SHA-256: `faa241cc0c3f97da84a6ba349ae95f47cc45049f1669fa0867c223d10a83713d`
`font_02_sfnt_off00019400.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19400	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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