PDF malware analysis — malicious · f30918e968dd9560

MALICIOUS

PDF

83.7 KB Created: 2021-09-26 22:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: d7e949f1df16a491dbfbe8204145f164 SHA-1: bc91c9211c1da2cf0e23e6aac9ed1c763a8d070a SHA-256: f30918e968dd9560b7b3da65b57ddb216862b816435dba11f0b4a06a0267e8cb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple compromised CMS upload links suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, but the overall structure points to a malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

Heuristics 5

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://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/61076545494.pdf In PDF document text
- http://studiocalderini.it/userfiles/files/27757805771.pdfIn PDF document text
- http://damutech.kz/upload/2021/09files/210919011715068907wac95.pdfIn PDF document text
- http://ueros.fr/admin/ckfinder/userfiles/files/fewobenobirifofujekirur.pdfIn PDF document text
- http://sumisaedu.com/FileData/ckfinder/files/20210912_18FE796ACA3327CA.pdfIn PDF document text
- https://tatvan.in/userfiles/file/simumosunipew.pdfIn PDF document text
- https://brs.jo/userfiles/files/73945862582.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b99a466831---budizexiguwaz.pdfIn PDF document text
- https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/43210951656.pdfIn PDF document text
- http://aotwcasino.com/ckfinder/userfiles/files/kizimuzerulexuwi.pdfIn PDF document text
- http://incomsistema.ru/ckfinder/userfiles/files/dobepirok.pdfIn PDF document text
- https://fleseriuassociates.ro/files/file/42116041680.pdfIn PDF document text
- https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/38136269037.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa99dbad1---4996583612.pdfIn PDF document text
- http://lsneotek.com/ckupload/files/kiwixoropikutot.pdfIn PDF document text
- http://ruihuitax.com/files/file/fisumirowinodomujuvowolo.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/65310431241.pdfIn PDF document text
- http://centromedicoveterinarioadda.com/userfiles/files/56815601579.pdfIn PDF document text
- http://studiotecnicostradi.eu/userfiles/files/zupudekaterakoxisovulijal.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7f3bc7d9---47286151682.pdfIn PDF document text
- http://przedszkolenisko.pl/userfiles/file/64795769763.pdfIn PDF document text
- https://johanbjerke.se/userfiles/file/tuwasokexufotexugepug.pdfIn PDF document text
- http://easternhoteljeju.com/FileData/ckfinder/files/20210919_50B404AAD98F99E3.pdfIn PDF document text
- https://bonvoyageindia.in/ckfinder/userfiles/files/73173320303.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/32128383061.pdfIn PDF document text
- http://immobiliareborghi.com/userfiles/files/5754439381.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=game+happy+mallPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c7d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7D8	9988 bytes
SHA-256: `e48d48b47d2e30c5d5803eee287095c21fb45af2e8c20dd2c6a31464cd8fb1ca`
`font_01_sfnt_off0000ddfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f60f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF60F	16188 bytes
SHA-256: `800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34`
`font_03_sfnt_off00010bc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BC1	20408 bytes
SHA-256: `f100c153ae90af36d2f7779acaeb8ef691d7395a4e8ccf65fe32aef2204a8559`

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