PDF malware analysis — malicious · b8360391476dc18e

MALICIOUS

PDF

92.0 KB Created: 2021-09-21 08:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c32326510bb3dc70043463defb299f68 SHA-1: 8fb91f510b3f701b58be65028865e578cc5368da SHA-256: b8360391476dc18e8bd2e9541263efe60d32262ac33f840a174e82dc0e9ab35f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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 http://skiflogistics.ru/userfiles/file/95894377411.pdf In PDF document text
- http://61kidsclub.com/userfiles/file/7931152533.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb89056864---81151250515.pdfIn PDF document text
- https://hoavily.com/uploads/files/lejuvevitazome.pdfIn PDF document text
- http://prakseologia.eu/userfiles/file/56934565748.pdfIn PDF document text
- http://sm300159.agchost.com/userfiles/files/51462061595.pdfIn PDF document text
- http://heydarbaba.org/resimler/files/sexakizuvebipam.pdfIn PDF document text
- http://szolnokepul.hu/userfiles/file/vuzigonexobe.pdfIn PDF document text
- https://szabolcsipeter.com/userfiles/file/73555342192.pdfIn PDF document text
- https://ebal.ro/app/webroot/files/userfiles/files/10855215856.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161463acbc73df---58342690619.pdfIn PDF document text
- http://meta-min.com/files/39932796087.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82093808c---66370836565.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210920004606.pdfIn PDF document text
- https://siriusdynamics.com/assets/uploads/files/86164499775.pdfIn PDF document text
- https://rtquery.reitoken.org/Coaching123/images/files/44492912955.pdfIn PDF document text
- http://vitrine-prof.com/files/23174583077.pdfIn PDF document text
- https://valenciamaids.com/userfiles/files/8320829099.pdfIn PDF document text
- http://energo-winstal.pl/userfiles/file/68569080276.pdfIn PDF document text
- http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/65726571897.pdfIn PDF document text
- http://phone-server.com/userfiles/file/96587070165.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ce9c7423---85238227057.pdfIn PDF document text
- http://fteq.ru/files/file/70101636679.pdfIn PDF document text
- https://oriontradecom.com/ckfinder/userfiles/files/57016205336.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614952aa34925---fisatum.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+free+coins+in+hungry+sharkPDF 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_off0000e983.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE983	21340 bytes
SHA-256: `fde72ea774a476e9092eb5b1d4d9299d0569d4d7ce71f6235795182ef63c62ef`
`font_01_sfnt_off000120ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120EC	10952 bytes
SHA-256: `776f2a2ff9e98ddde1aa85a5b28e1ab02adbceec55ab538ddc45e44ab505ceac`
`font_02_sfnt_off00013a5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15269	3892 bytes
SHA-256: `1e4451e83b6f52f572d031d1b19e20c79940e51bfa82678b6f73e3b6cd6954e1`

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