PDF malware analysis — malicious · 72fcb1cc9e7c9c08

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: c5e043933fd3836291caee80e7251da8 SHA-1: 027b42d0b3dd29a5f52d39ef0f92ce2addc0e54f SHA-256: 72fcb1cc9e7c9c08188679fefded5769b63964dde07e73117fd1e2d562cd7f1c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Password-protected archive handoff' heuristic suggest a phishing or social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://haitrungkim.vn/uploads/userfiles/file/koduzelosiwimuzo.pdf In PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r4klqqjf2nbgkftur60kvmtdf0/mizukexopewogelogapotupul.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d04848198---tolumabewagavaxawip.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/10219464620.pdfIn PDF document text
- https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/9c1c620c7ff9439dabb75c4a12dea922/jitenebejiwirewuraviked.pdfIn PDF document text
- https://vishalahospitality.com/ckfinder/userfiles/files/63358452492.pdfIn PDF document text
- http://seed-hongkong.com/uploads/file/xuwawifogurotoj.pdfIn PDF document text
- http://integrotech.pl/zdjecia/file/zejeguxuwogunuvipamonebu.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91fe98b3f---kugofepix.pdfIn PDF document text
- http://shiny-baby.com/fileimage/file/58576410628.pdfIn PDF document text
- https://aiaciran.org/cache/fck_files/file/xamimavuvebo.pdfIn PDF document text
- http://thamcohoaian.com/webroot/img/files/bavup.pdfIn PDF document text
- http://bbmeti.it/userfiles/files/nafasa.pdfIn PDF document text
- http://dtpokebar.com/uploads/files/nimutoterarunofexigejo.pdfIn PDF document text
- https://pastijptoto.com/contents/files/lumesawunajov.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/lixosuneninanitalasurotez.pdfIn PDF document text
- http://polandpools.com/contents/files/vaxaniguxizomitezitakuweb.pdfIn PDF document text
- http://vervesimuhub.com/userfiles/file/tikawodawilileveji.pdfIn PDF document text
- http://grimastone.ru/files/79045140587.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/zotefigevejasogigabowa.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b467ce6c4---15688747164.pdfIn PDF document text
- http://gryfarmerskie.pl/pliki_wyswig/files/biwokawelako.pdfIn PDF document text
- http://reklama-v-sochi.com/ckfinder/userfiles/files/49148816252.pdfIn PDF document text
- https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dexemuxomob.pdfIn PDF document text
- http://autodilygood.cz/files/file/duwipiruwudusiguxuvaxa.pdfIn PDF document text
- http://leebyunghun.org/new/upload/board/files/62088198058.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+controller+binds+fortnite+xboxPDF 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_off0000b639.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB639	10604 bytes
SHA-256: `ebd4546b83c6105ee238db8fb37c0bed36929f65853f88ff500c6bbd9fa5b3d9`
`font_01_sfnt_off0000ce90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE90	15332 bytes
SHA-256: `44c2335ce5b7c79646deb2f43859af48d5b0bec500ebc59736796c55eb21b4e6`
`font_02_sfnt_off0000f5d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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