PDF malware analysis — malicious · 378a1e143f2395ff

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 21:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 840cfe0986ff45ac12d9d52dfccefaa1 SHA-1: 42d3bee2918cc35aa2a7ea5002a4ab00f9a6959b SHA-256: 378a1e143f2395ff7073dd0052e0c560433f6cd2f9cda7f435a7250562946fc0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a browser installation lure. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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.
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://drafthe.ru/uplcv?utm_term=free+download+ucweb+browser+for+android+mobile PDF link annotation
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6ghf37n9pfe2to50ru2n261ktp/65223760470.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a75aad18db804630a92706276681aa21/40947285777.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5648a0a9---19310180622.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/fejim.pdfIn PDF document text
- https://goez3.com/10005001208290177/ckfinder/userfiles/files/2566154517.pdfIn PDF document text
- https://marathonblainville.com/userfiles/files/75495164928.pdfIn PDF document text
- https://suadienlanhhanoi.net/upload/files/zixotusokodokazovo.pdfIn PDF document text
- http://flexinform.com/hirlevel/file/kobejevasaduwanij.pdfIn PDF document text
- http://mmsmarin.com/imgimage/file/78058238254.pdfIn PDF document text
- https://ezokniga.com/uploads/file/4466962047.pdfIn PDF document text
- http://nuitsdartistes.eu/images/file/61630542871.pdfIn PDF document text
- https://tonitomov.com/picture/file/76514960658.pdfIn PDF document text
- https://egokituz.org/files/galeria/files/24082911706.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/zapuseza.pdfIn PDF document text
- http://bong-dem-long.org/upload/editor/files/tuwamoji.pdfIn PDF document text
- http://rapet.hu/files/1310417469.pdfIn PDF document text
- http://teamtrinity.net/trinitya/file/98105782841.pdfIn PDF document text
- http://osmed.cz/app/webroot/files/files/65528469604.pdfIn PDF document text
- http://abwingssuffolk2.com/uploads/files/15206615531.pdfIn PDF document text
- http://www.anaja-inter.org/public/file/gabekalavibusagevig.pdfIn PDF document text
- http://jarauwerdaenzn.nl/userfiles/file/dijoxemokupovavede.pdfIn PDF document text
- http://alocainghien.com/uploads/userfiles/file/29184279300.pdfIn PDF document text
- http://hieuchuan.com/upload/files/77396703569.pdfIn PDF document text
- https://ka-base.no/images_students/files/75000440012.pdfIn PDF document text
- http://dermalab.pl/userfiles/file/92994400222.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBCE	17536 bytes
SHA-256: `2c3a621fe502c14404e428e1d3bc9e437db05b31ea9c763c42334386ab5dd981`
`font_01_sfnt_off000108b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000120cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120CD	10844 bytes
SHA-256: `25ed2643f7883bf8bd211482162f68cb6bc796653060ac7a13ed1df803d7b7b5`

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