PDF malware analysis — malicious · 9479eefa6e34249a

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 16:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 5143df2754e605fb672b877d8cd1e95c SHA-1: 5ea58467ec973692631aaba3b709c430be9ff045 SHA-256: 9479eefa6e34249a691bccd5183a6278a99c0df609cf48ccd2b57d8c9a10ebd9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites, functioning as a link farm. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering via the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a074271f49---6692148380.pdf In PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ncnk0fv2883que3pp6jjshdtu6/poribowexikexex.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aded826e5---2290071085.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r9i6e0u2ukeqa0rl9p22nv2bpi/77813003946.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3db7e7a896e12c8ab30914cd44f549bb/97151908423.pdfIn PDF document text
- http://t-eamplus.de/web/editor/files/jubufugapege.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2fa3e464---lexotinigaj.pdfIn PDF document text
- http://phantasos.org/userfiles/file/nesubewipebatogen.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e26a66f696d3ce0d70ce672cbd6276b9/bozemelagosulu.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e436b130c3---welodolup.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce758cb0b7---70572738632.pdfIn PDF document text
- https://nestsearch.in/admin/uploads/file/xuxozom.pdfIn PDF document text
- http://timandlor.com/userfiles/file/23693994191.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/41016169238.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kih2irosj8nufj6il6obn861t3/sikodosifunivabudaraf.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609424d8602c4---xazod.pdfIn PDF document text
- http://drshapard.com/clients/73598/File/15959842054.pdfIn PDF document text
- http://zabradli-znerezu.cz/userfiles/file/3249765474.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5b1l228ntpbm3b8bsai6k91ji6/suzutepusinu.pdfIn PDF document text
- https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/31781671388.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cd9370569---91461507615.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714e2e833e8---kenuvujigabejevadifuja.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c637aed4d1---82726655788.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=different+kind+of+squatsPDF 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_off0000f98c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF98C	10640 bytes
SHA-256: `b6d41cb6ad6f31086bfcf3d06127c94338fd5c0da414a453be7b146a26cff0d0`
`font_01_sfnt_off000111d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D5	17148 bytes
SHA-256: `fad34f5dcf4befdebf676739a2e7b8d360d4e2a06375eab98efdf7bd687fbb72`
`font_02_sfnt_off00013e6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E6C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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