PDF malware analysis — malicious · 20f535d5510a5343

MALICIOUS

PDF

86.1 KB Created: 2021-08-15 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bb8a912ed42787449e01a21ce9069585 SHA-1: c702e141e2be643b40c052ca95a1754ba52ba122 SHA-256: 20f535d5510a53439109431dbdfdf572f2876c0f5f58b55bcadbf8400f4d24ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious files. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://medizator.ru/ckfinder/userfiles/files/33468219233.pdf In PDF document text
- https://ascii.tn/web/cgi/file/varopuranesep.pdfIn PDF document text
- http://angarakshaksecurity.com/userfiles/file/67458667942.pdfIn PDF document text
- http://hevolta.com/upload/file/87244465477.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56740dd7d---67514620189.pdfIn PDF document text
- https://nenanhduong.vn/Upload/files/zujifom.pdfIn PDF document text
- http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gora6b1nmee1mggp29nvuecld5/gobevaramifakekiro.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/93f48486e561e2f97e5bb920606d0bfa/62870467783.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160796f05541d9---85269375569.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff3e5efb6---55316004471.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/nenufugamopapekid.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a8cc5c794aeba7ecc236ebcecca0662c/77481306099.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c3869eca4---16260571490.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/dfe693fff7b01580f144116969093b8c/pemixoru.pdfIn PDF document text
- http://slesnick.net/userfiles/files/nijumipawo.pdfIn PDF document text
- http://penzionriverside.cz/files/file/pijuboketozoxuko.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nbjp8jg26udl7tbf8u48rqftl2/67304925574.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f57969ac4---riguxonubulojebezafaga.pdfIn PDF document text
- http://twtipa.com/upfile/files/2021/06/20/figitenuposexew.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d84ec2e9e---batupalolepilexugu.pdfIn PDF document text
- http://imbirimbir.ru/files/74936677580.pdfIn PDF document text
- http://bright-mineral.com/uploadfile/file/2021060114593790.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fdbe840b9---vovolesojojivesejem.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/24033255232.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075849197b31---28265231924.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/sabufa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=epfo+online+claim+form+15gPDF 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_off0000ebc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC8	10724 bytes
SHA-256: `e8e58423242570c37c0cf4b73257568049f1b9bcbf626e8e0630ff1de53305c2`
`font_01_sfnt_off00010467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10467	17264 bytes
SHA-256: `9e6ec85939a0fa605ddb605dd0492fdfb1f7936453c0d004d7bbb3af57153641`
`font_02_sfnt_off00013126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13126	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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