PDF malware analysis — malicious · 728392a1f1e6e9c9

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 20:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a10aa9eeed4b0868d845a8e9ca8cf3c7 SHA-1: 11c3f5dfb1b6db6a4ca742f56dd82cd0a2736dee SHA-256: 728392a1f1e6e9c94a063a9c9f2fde1f89c203f6426de44282d6f7ecf47133f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and is identified as a link farm, suggesting its purpose is to redirect users to potentially malicious websites. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. The file likely serves as a lure to initiate phishing attacks or distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=concept+of+electronegativity PDF link annotation
- http://taxicityplus.ru/userfiles/file/45106077496.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744204f2205---nimovovagiteladezepewaxu.pdfIn PDF document text
- http://mobilenmr.com/files/files/lifuxagopopakoririto.pdfIn PDF document text
- https://cr2tek.com/userfiles/Proj_Name//files/nanowurokavifenivopin.pdfIn PDF document text
- http://tyextractor.com/d/files/7202170565.pdfIn PDF document text
- https://bookatowncar.com/userfiles/file/jitababebuta.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8fkq6adm0anajktq89i8odbsh5/punexexinefezos.pdfIn PDF document text
- http://cke.hk/userfiles/35767211498.pdfIn PDF document text
- http://sintellect.ru/Repository/file/55359259554.pdfIn PDF document text
- http://mynigaoe.com/upload/file/20210520130843.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rvodf8vhlg9omfp2fscrq1os4k/sonemiwabe.pdfIn PDF document text
- http://xiaohecollege.com/d/files/xegatidanelidokixuferuwa.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/f3qqdslpoi151rcjfr6u1g6bim/kasepog.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f913b6b17153e15214bb64d90e0c1495/2548805268.pdfIn PDF document text
- http://darec.sk/files/files/todose.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c176f1746fd5a91613fa1885bbfb905c/gagijefakatubiba.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ca0f148fe34a2758255b5481cc228bd5/1840849075.pdfIn PDF document text
- http://mlsy.cz/images/file/files/govizozirobinuniwemuwonol.pdfIn PDF document text
- http://bmsorganica.com/userfiles/file/bulisaloxabokopoterojogo.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1oah6jbj9la8ieu5som03f7845/nelowi.pdfIn PDF document text
- http://dytac.hk/userfiles/90338331560.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bbceuh4oqdpalqu57ur2cs0hh5/75126188647.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/dufebe.pdfIn PDF document text
- http://greenmodels.ru/uploads/files/40060429003.pdfIn PDF document text
- http://asckhn.com/acskhn/userfiles/file/degepabujipuvikizi.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/sugowogobexotoz.pdfIn PDF document text
- http://rocb-ap.org/file_media/file_image/file/zogexagonebevadakuloti.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_off0000e530.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE530	10696 bytes
SHA-256: `926f319bdf93c92383364dcef6d579f91dbc7d090bb169cfd9b41e1f0973277e`
`font_01_sfnt_off0000fde5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDE5	18108 bytes
SHA-256: `2332992886399e018263416ff7688aa37f091c8b81e92c6f0380416817bcd8e1`
`font_02_sfnt_off00012c99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C99	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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