PDF malware analysis — malicious · a5a16ea8ff68302b

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 00:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 45f4be5255bdb516536c0f56474a2d5f SHA-1: 688f1aabf3601c5b7f1d3f515245f3afa5e6f96e SHA-256: a5a16ea8ff68302baca4e12b6db5ea3b655fe877c8439871c9db2e5d261b684e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, flagged by heuristics, indicates potential malicious scripting capabilities. ClamAV detection and ML classification strongly support a malicious verdict, likely related to phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=word+to+pdf+converter+free+offline PDF link annotation
- http://bajajsports.com/userfiles/file/69075458005.pdfIn PDF document text
- http://malbreil.com/userfiles/file/fobinif.pdfIn PDF document text
- http://df-2.de/images/daten/file/5644789064.pdfIn PDF document text
- https://llsindia.in/FCKeditor/file/32281976293.pdfIn PDF document text
- http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076350ede622---76291105597.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/62502722058.pdfIn PDF document text
- http://somsit.com/ckfinder/userfiles/files/gofinutemibo.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/16195039990.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/abqfkjidpl4137dbrjdle1b5gv/78480104840.pdfIn PDF document text
- http://maiodi.com/userfiles/files/46579236804.pdfIn PDF document text
- http://bocghebinhduong.com/media/ftp/file/44712699346.pdfIn PDF document text
- https://activepymes.com/pub/file/91523947501.pdfIn PDF document text
- http://kubak-ubezpieczenia.pl/userfiles/file/melezep.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611739a53ee30---85292143239.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pshpohd7846m3u6m2d74l5iuf0/lafig.pdfIn PDF document text
- http://tv-sat.cz/userfiles/file/zaxolikol.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd59ac937cb---4933000302.pdfIn PDF document text
- http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nijadesi.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9duonncn14hmau23r4o9jr6ch9/tozatadabamikosipipija.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/51245283468.pdfIn PDF document text
- http://akinmedical.com/uploads/file/7488087871.pdfIn PDF document text
- http://pazzo.jp/js/upload/files/kabizafesatesizu.pdfIn PDF document text
- http://chroscina.com/userfiles/file/kolusawemowemax.pdfIn PDF document text
- http://pamat.ro/UserFiles/file/gufuwozopesa.pdfIn PDF document text
- http://autofactory-jin.com/js/upload/files/seweginimijojawiziseb.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_off0000ca95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA95	16872 bytes
SHA-256: `fa164156fdd432b0e294cc78725e634d71b96dcd9ff581963289c61c811168e7`
`font_01_sfnt_off0000f64b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF64B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E62	10340 bytes
SHA-256: `be86e4c89c1c83bec542cc007d40e59db5d3a24ca29d34c0e45ad2c3a1d0a84e`

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