PDF malware analysis — malicious · 2cfaac8ff6718cec

MALICIOUS

PDF

102.2 KB Created: 2021-07-08 15:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 821c0991b1d649471c8766dce0f472e6 SHA-1: 01a184618e9ff935b2b3d80e60db4949fae004f2 SHA-256: 2cfaac8ff6718cecb93c613ccfd56480988d21455072ed0889eb5233c8bb8b7e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports this malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9773

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://hzjksj.com/images/upload/File/1746005576.pdf In PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/2638800675.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596f8937c6---81653095926.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6f7cd556f5236c77c0f632648f6c6352/lidubekararataza.pdfIn PDF document text
- http://targdenunti.ro/userfiles/file/66333231937.pdfIn PDF document text
- http://youandisagenix.com/ckfinder/userfiles/files/sokijafabefatepof.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/711a07e565d82ec5cb4a95892e2491f4/vukewuvuverub.pdfIn PDF document text
- http://slsnn.ru/content/file/34965113543.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9utoc3kirljhmqlmmmalcb1vcj/numude.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ef9b2206813d549846e6d53eeae84f62/88051466587.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vg6cs9tkv95i6a095j6ik9pq7e/88124316257.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f452cb1---74985587071.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///202106296503_301184568.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff616a4dad---54724462906.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c86d02c765051af3a8ecab459ae5b0df/wokojedakabikemulekuzeje.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b46a970d---85236940628.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc33c2145---pesujoki.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a02fa03a3---77670908389.pdfIn PDF document text
- http://oio.cn/uploadfiles/files/70576172039.pdfIn PDF document text
- http://daiichilogistics.com/uploads/news_file/jogakatizevenejasepezop.pdfIn PDF document text
- https://betibg.eu/webroot/img/files/6167390160.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c81587c94eb213c9bf0b9b8810eedd4/13969475239.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dfc8390b57adcad2f47ca9c0514a6198/xofanazitiroradukavixara.pdfIn PDF document text
- http://daoltrading.com/userData/board/file/43818366777.pdfIn PDF document text
- http://cathyourhair.nl/js/ckfinder/userfiles/files/xuwugesenojenavefaku.pdfIn PDF document text
- http://mastera-mix.ru/ckfinder/userfiles/files/wuwewisiburenuzu.pdfIn PDF document text
- http://iphonedown.com/ckfinder/userfiles/files/88682463790.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=love+is+deep+quotesPDF 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_off00012ed2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000146e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146E4	17680 bytes
SHA-256: `a6c82b71b404d11c61e4528faf3b8c58a5850123eeef9d8561f356d19839be88`
`font_02_sfnt_off0001746d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1746D	10240 bytes
SHA-256: `08a5f0a38c0197c884f82f9f54ad88f6740e3cc76b7d5535a02dc7d4d89d7819`

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