PDF malware analysis — malicious · ef4b21ffa904080b

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 18:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9af0394f75f00c05dd5c97e9c4f26b05 SHA-1: 7ee72a0ed935f22885616f240d0fdcb347ecbb3a SHA-256: ef4b21ffa904080bd9d0c27508369c2d6307cc1ccadfebe53b9572842d2dd3db

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.7921

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.
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
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://ketchas.ru/uplcv?utm_term=how+to+recover+data+after+reset+factory PDF link annotation
- http://abwvictory.com/uploads/files/37246128189.pdfIn PDF document text
- https://diarch.in/WYSIWYGImage/file/valopawa.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/kuvike.pdfIn PDF document text
- https://ismet.com.br/ckfinder/userfiles/files/68147574269.pdfIn PDF document text
- https://soi.icami.mx/ckfinder/userfiles/files/tugum.pdfIn PDF document text
- https://confidence-ist.com/ckfinder/userfiles/files/rexulovewobujonimi.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdfIn PDF document text
- https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
- http://smcertificationservices.com/userfiles/files/41930894412.pdfIn PDF document text
- https://eirai.org/editor/ckfinder/userfiles/files/99766513162.pdfIn PDF document text
- http://architettoletiziamasciotta.eu/userfiles/files/fuvudovesijij.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d7068f0f---27873054041.pdfIn PDF document text
- http://taiwan-casters.com/userfiles/file/51250834834.pdfIn PDF document text
- http://auksozvynas.lt/userfiles/file/zozujaxulusuti.pdfIn PDF document text
- https://santaclara.com/wysiwygfiles/file/tanowekapufijo.pdfIn PDF document text
- https://swift-tw.com/lcc/upload/files/rapubesid.pdfIn PDF document text
- https://gadd-asso.org/userfiles/file/65275227283.pdfIn PDF document text
- http://www.examnotice.in/uploads/files/57686476775.pdfIn PDF document text
- http://nemalipics.com/5896311066.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7978c56a---43103596870.pdfIn PDF document text
- http://rexant.by/upload/editor/files/85081128534.pdfIn PDF document text
- http://www.sczct.com/up_files/file/30547160284.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51db4d7d---55043699397.pdfIn PDF document text
- http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn 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_off0000cd3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD3F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE551	17184 bytes
SHA-256: `d4f9668ebd5489d1cf0b6a7d22005606c6fa33ca2661505bd58fbea05be3cdc0`
`font_02_sfnt_off0001114b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1114B	10484 bytes
SHA-256: `a56a74b9a609dd9325294fa4e55c1998f1ecc61af5588d36adf086213b331b32`

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