PDF malware analysis — malicious · f643f5326751cb59

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 373f9d2806733b23b36499749b74d5a6 SHA-1: 4b13bca9b71926d8318d1ac1711f34589f106094 SHA-256: f643f5326751cb59c2f06678b1fc517521bc3b04aa0ffb4fbeea49c9234c56f5

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest it is designed to lure users into downloading further malicious content or visiting phishing sites. The 'SE_BROWSER_INSTALL_LURE' heuristic specifically indicates a social-engineering tactic to trick users into installing unwanted software.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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 https://queure.ru/uplcv?utm_term=apps+keep+crashing+android+11 PDF link annotation
- https://solucionaesp.com/ckfinder/userfiles/files/24318959465.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a169fc0e2e---99666854203.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e71fe6e022bee0aae2c07d6b08d4267d/31102285734.pdfIn PDF document text
- http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/57472620234.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced72beac---jegixad.pdfIn PDF document text
- http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/140344141444.pdfIn PDF document text
- http://materialdeestudo.top/userfiles/files/tajaturixosopibiwejowukof.pdfIn PDF document text
- http://papinchess.ru/userfiles/file/32000162203.pdfIn PDF document text
- http://abnigakgdsg.friendship-match.com/upload/files/lalutiwevisezuginap.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/96106119865.pdfIn PDF document text
- http://recuva.kr/upload/fck_img/1630630685/file/nerojakanedanab.pdfIn PDF document text
- http://toyotarent.tw/FileData/ckfinder/files/20210907_2A61B1E50FE38929.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/31403307272.pdfIn PDF document text
- https://huaienclinic.com/uploadpic/files/nidefel.pdfIn PDF document text
- https://intervalhousehamilton.org/ckfinder/userfiles/files/rarurufimejiwugixeka.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406ebe67d36---rurokimilovazile.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/45938155445.pdfIn PDF document text
- https://corumosmanlimakina.com/js/ckfinder/userfiles/files/23656519998.pdfIn PDF document text
- http://togul.org/sites/default/files/file/xiruli.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/ximovajutoruw.pdfIn PDF document text
- http://ecosdaliberdade.com/ckfinder/userfiles/files/juvosumidogojebaliguxa.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132e601066c3---41914287946.pdfIn PDF document text
- 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_off0000dc49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC49	2044 bytes
SHA-256: `97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d`
`font_01_sfnt_off0000e598.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE598	10772 bytes
SHA-256: `e385b3192914f84c57f9e47b4942378dc88d69e8c1e02ca9e2f1adda84269f58`
`font_02_sfnt_off0000fe31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE31	18396 bytes
SHA-256: `b11d76d18d9677b76e249bdc236a4fb9af6479f748248ea90b39d50fd94ba554`
`font_03_sfnt_off00012e33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E33	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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