PDF malware analysis — malicious · 8471ea3b30d43812

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 21:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 888e9b75ce0675807cfa03b54cc65428 SHA-1: ad4b49f1303489d2301bbe6dcd34bb285b3538bb SHA-256: 8471ea3b30d43812cebf774bba73fdf0558502947a258150b6fdb06c2f812a1e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing or malware download page. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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
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://vietsonplastic.com/uploads/userfiles/file/vedapira.pdf In PDF document text
- http://chinalabware.ru/d/files/vikomog.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/fd5613b7014e795b4b906b324104fca3/11924670183.pdfIn PDF document text
- https://southafricapools.com/contents/files/makufirebopunulugitoro.pdfIn PDF document text
- http://playbabydoll.com/userfiles/file/73017986846.pdfIn PDF document text
- http://euhoca.com/js/ckfinder/userfiles/files/67806162224.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/puvijuxigimaz.pdfIn PDF document text
- https://thebillionbottom.com/business_school/uploads/file/musapeso.pdfIn PDF document text
- http://ausafe.net/images/art/files/jegidexifetofadagegof.pdfIn PDF document text
- http://baheth24cars.com/ckfinder/userfiles/files/3281378394.pdfIn PDF document text
- https://mut-zur-veraenderung-hambuch.de/userfiles/file/vivatejimesurobesoz.pdfIn PDF document text
- https://keiba-like.biz/js/ckfinder/userfiles/files/nipofuzugige.pdfIn PDF document text
- https://vasutaszeneiskola.hu/ckfinder/userfiles/files/tukegelibas.pdfIn PDF document text
- https://campermagazine.tv/public/file/paborebafizirowivaga.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
- http://www.corazondelsol.es/ckfinder/userfiles/files/xuzuvinitusozixemeb.pdfIn PDF document text
- http://ticketsperiodico.com/galeria/files/xejaxasituxenalivopule.pdfIn PDF document text
- https://isigakizima.net/img/tmp/file/bopamimekatapavijasil.pdfIn PDF document text
- https://jin-ji.com/upload/files/zomibasupob.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161438d1e2e115---93435524456.pdfIn PDF document text
- http://thicongdiennuocmiennam.com/uploads/files/57283989336.pdfIn PDF document text
- https://balticstroy.com/uploads/files/96196950569.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/77564819318.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132081358076---22539030478.pdfIn PDF document text
- https://samsunyapi.com/userfiles/files/74808603846.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=american+card+generatorPDF 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_off0000dab0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAB0	10480 bytes
SHA-256: `fa8df75ddf2cbe11ad2d0e0aad124047b55f596b2e0620daaaa6514de2959553`
`font_01_sfnt_off0000f248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF248	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A5A	17032 bytes
SHA-256: `d5003611b29fabf76a032700a10e2e0e733611723674637fac3ad914c49892e6`

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