PDF malware analysis — malicious · 816e4617f66bc6a3

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 14:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: cffba6511f47f0fecc68ad8f4420289c SHA-1: 0d06b19b368cff74e873d8929f7102cfecb4289e SHA-256: 816e4617f66bc6a3fd83bac37b542d1db7100a4f0cfd9a694a323520e9072c41

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identify it as a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bef3c9effd---9582695397.pdf In PDF document text
- https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/25521813391.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/ledaropelugeliw.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117238be6928---dixageripozasosun.pdfIn PDF document text
- http://arniestribu.com/campannas/file/liguriwowelanuzelipu.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e03457b24cd3e02687459974a3fca77a/lunef.pdfIn PDF document text
- http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b0acef2cb---fudapaw.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608639d598da7---tijivovuba.pdfIn PDF document text
- https://varbackaforskola.se/ckfinder/userfiles/files/92141569602.pdfIn PDF document text
- http://annandale1963.com/clients/69704/File/batizufitaxa.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab076a6f4f4---91464469940.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b1b7c79615812f85e92590af381b7cef/15670661463.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/28019784267.pdfIn PDF document text
- https://arket.io/wp-content/plugins/super-forms/uploads/php/files/t751hmh3gm7u7h9snjr0gmbveg/55299924809.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/58n421ul7di78jiav6iermdhfh/fodofogebo.pdfIn PDF document text
- http://choinka4x4.org/cms/files/file/58212227216.pdfIn PDF document text
- http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/liwiwoxokopufaxud.pdfIn PDF document text
- http://kerama.altrodesign.eu/ckfinder/userfiles/files/64261810723.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725baaba15f---63704316099.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d509acce71---1408435118.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/895fd8a6a11b1268413d944180fa7b25/vozivurexabedud.pdfIn PDF document text
- http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5a42418---93719831486.pdfIn PDF document text
- http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/ramevanewedilop.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191f3c47cae---63031342849.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=science+comprehension+worksheets+for+3rd+gradePDF 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_off0000dc69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC69	17132 bytes
SHA-256: `fefd23ff6b400a896a9d914a520c91084d44102eb46105afb798311260267868`
`font_01_sfnt_off00010862.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10862	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012079.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12079	11444 bytes
SHA-256: `8add9932c1eea7ddc8b318fabb760e31dcb9dd6554387f1303809f83374831e8`

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