PDF malware analysis — malicious · 082b113c663913e7

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 20:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 8c9cd5ba66547b6304b2e52c4fba7e7c SHA-1: 1ceedc1e061815aab532a73829dc46c315f6eab9 SHA-256: 082b113c663913e7993056f3c12e8ff126b564c4119732f2a08278360cb77dbe

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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://coretry.ru/uplcv?utm_term=puffin+browser+pc+full+crack+2021 PDF link annotation
- http://garage-fuji.jp/js/upload/files/xagoxarasofuvit.pdfIn PDF document text
- https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78511480856.pdfIn PDF document text
- http://brandweeramsterdamamstellanden.nl/userfiles/file/bawupufilotalewik.pdfIn PDF document text
- https://mchs.kz/userfiles/File/rosadetine.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134953b0fd43---90609246272.pdfIn PDF document text
- http://doorsatyrau.com/ckfinder/userfiles/files/vefivadirarifutubelika.pdfIn PDF document text
- https://ehbo-oostkapelle.nl/userfiles/file/76420001547.pdfIn PDF document text
- http://minhnguyenvn.com/uploads/userfiles/file/bifeg.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfb707f6e---jonexozoxopovasekebim.pdfIn PDF document text
- http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
- https://ribaczpeter.hu/files/file/54481764020.pdfIn PDF document text
- https://get-insurance.in/ckfinder/userfiles/files/23539343769.pdfIn PDF document text
- http://bibrka-school.org.ua/ckfinder/userfiles/files/13712873503.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b9f77529---51605702444.pdfIn PDF document text
- https://abisspaandboutique.com/nbloom/fckuploads/file/wesog.pdfIn PDF document text
- http://king-pro.com/userfiles/files/midubawemojedakumuliki.pdfIn PDF document text
- http://embody.box8websites.com/ckfinder/userfiles/files/jiwutenirujibofolumilu.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5c679b4a45d7e18d00a9a974fc63006c/sowefelilofawilage.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/ketilexirolezibilurew.pdfIn PDF document text
- http://copingconversations.com/userfiles/file/fepasujuxedetar.pdfIn PDF document text
- https://chameleoncoupons.com/adgprocessing/uploads/files/tuvavagabosowazavuxagufug.pdfIn PDF document text
- http://coeb.eu/userfiles/files/11639318367.pdfIn PDF document text
- http://orkoien.com/userfiles/files/57710454014.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132107173259---9782981012.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_off0000ba6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d282.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD282	11088 bytes
SHA-256: `31e81ffc104cbfa66f2987c4968b75decf24c7f7384a883d68385c31e7b6dbb1`
`font_02_sfnt_off0000ec62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC62	16568 bytes
SHA-256: `1aa774f774f238534bb294023667f69cd7df7ea898de643f5420ad394df7ab5e`

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