PDF malware analysis — malicious · dba5985f8052d468

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 423b28679c06fe670e9647e9c18f61e9 SHA-1: ee95cb867380a8b62f5db6845171986828e73aed SHA-256: dba5985f8052d468c7873df67434dfb70230b633885505c6edcd5fa7c0f8ec02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce1839d0d---80529511775.pdf In PDF document text
- http://ulsantour.com/FileData/ckfinder/files/20210912_B58563DBD75591C8.pdfIn PDF document text
- https://doxity.ro/ckfinder/userfiles/files/59050319981.pdfIn PDF document text
- https://samngaimarble.com/html_upload/file/74789884824.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d78d027---xakezunibedinadelorurofo.pdfIn PDF document text
- http://huthamcauquanggiap.com/upload/files/40514784435.pdfIn PDF document text
- http://surveycook.com/upload/tmp/202109/file/45251401724.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/89605367874.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/gebunozokulozinigu.pdfIn PDF document text
- http://yuhao-tech.com/userfiles/file/35487379968.pdfIn PDF document text
- https://ceccarbotosani.ro/userfiles/file/nalegoxapetubop.pdfIn PDF document text
- http://dochoiotovn.com/uploads/userfiles/file/76068578962.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e02e97f6---6026956392.pdfIn PDF document text
- https://fasleh.net/Files/files/63926808614.pdfIn PDF document text
- https://glearningsolutions.com/userfiles/files/loranekisofikinogejuzis.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/57143068514.pdfIn PDF document text
- http://bjsddesign.com/filespath/files/20210919071841.pdfIn PDF document text
- http://yuanhebiotech.com/upload/files/76348458369.pdfIn PDF document text
- http://abwnickersonplaza.com/uploads/files/zazujip.pdfIn PDF document text
- https://adurucui.com/ckfinder/files/25107477165.pdfIn PDF document text
- http://www.ciesol.es/ckfinder/userfiles/files/lalunudek.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fb461212bc0ffc7f41dcc8bc2cae858/49266433403.pdfIn PDF document text
- http://balogmihaly.hu/UserFiles/file/503788450.pdfIn PDF document text
- http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/50878395933.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371919e4829---buwemutilotebifizupasi.pdfIn PDF document text
- http://abwvictory.com/uploads/files/34735758367.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=flash+projector+apkPDF 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_off0000db8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB8B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A2	10472 bytes
SHA-256: `0928e2add1ac0a8e8c65a4908453917905db4323297fdcfd2a808712a1070186`
`font_02_sfnt_off00010ba0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA0	17812 bytes
SHA-256: `ef1b9f411946968f9135a3e1077c93cc7ed65bd3abc4216eaedf55fb6082e003`

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