PDF malware analysis — malicious · c553fc66e3d467cd

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 01:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 5c899719bb5c6ac8b0c3254ce9411325 SHA-1: cd69a896f0b0be7a40edd2cd86ad66df16bde66f SHA-256: c553fc66e3d467cd4fa63d57ca9c5c17105c65598f0580805894073d2ea438b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/81cb1e5165507aaffcb688c596285b47/51811298675.pdf In PDF document text
- http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92997408094.pdfIn PDF document text
- https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/zudikuvadofigomepizenev.pdfIn PDF document text
- https://mercerapparelss.com/userfiles/files/zeparunulezog.pdfIn PDF document text
- http://lotusromeo.fr/app/webroot/files/userfiles/files/76222166488.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0fe2a83aa07aaa820f0cab7d621482a3/15615361329.pdfIn PDF document text
- http://pp-aqua.com/userfiles/files/24243197067.pdfIn PDF document text
- http://hosungtour.com/FileData/ckfinder/files/20210917_556DD03663E59A93.pdfIn PDF document text
- https://duocvinhkim.com/userfiles/file/patatikut.pdfIn PDF document text
- https://lrsdev.com/userfiles/file/xisitawilufukelowelemotuw.pdfIn PDF document text
- https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/82219055607.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3041626d---dozofowa.pdfIn PDF document text
- https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rewumatinuzukit.pdfIn PDF document text
- http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/29509129855.pdfIn PDF document text
- https://eirai.org/editor/ckfinder/userfiles/files/99766513162.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/70246930798.pdfIn PDF document text
- https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/durodigaborojowejosuz.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/84360698051.pdfIn PDF document text
- http://bjsddesign.com/filespath/files/20210908204924.pdfIn PDF document text
- http://lsbwg.com/ckfinder/userfiles/files/20210915/1614464653.pdfIn PDF document text
- https://mekongtransport.com/upload/userfiles/files/31337308626.pdfIn PDF document text
- http://savoie-outils-coupants.com/ckfinder/userfiles/files/wekit.pdfIn PDF document text
- http://mkbeauty.vn/luutru/files/56903547115.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dddbd043c7474d5247abfeab60a6714c/zubasiredobe.pdfIn PDF document text
- https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/37d08752cd3a2b69ad81b309712a5360/99008231186.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ranch+simulator+online+play+for+freePDF 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_off0000f58e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF58E	11004 bytes
SHA-256: `48571d6960d9625550aa620b9c647b3b3741b7baf047a2f4548ca02477ebe99e`
`font_01_sfnt_off00010efd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EFD	18252 bytes
SHA-256: `af644113bd4958a6f8469efe9e2615401229a0bbad3d7242f69123c9fd1930fc`
`font_02_sfnt_off00013e2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E2A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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