PDF malware analysis — malicious · bea342529df24313

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 22:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dc1ed7bffccd1ceebe53bae3d66ba5b6 SHA-1: 0f409bbb33d0546be6d6de40cff43dac194b7555 SHA-256: bea342529df24313830f7124e5293a977ddb8da560d1ff1964a267989db8b9ae

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=british+clothing+sizes+to+american PDF link annotation
- http://planet-for-events.de/userfiles/file/71608958811.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/52487731531.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a1672a577f3792e4ae62fcb66866e19/22764092033.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/10884555165.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f933eb7570---mesizaloragiketise.pdfIn PDF document text
- http://dungcumaymoc.com/Images_upload/files/wuzemibifitisenaw.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/wusududuto.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f48sft10c6pl5kaoc5h520essr/lojat.pdfIn PDF document text
- http://dso-fuzine.si/docs/62120194301.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e0e404b7fd9e0573a2ec1f0043e853db/31198485608.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca6c239f9---73343695222.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3754b1d31---korosawebemaritopa.pdfIn PDF document text
- https://yenhuy.vn/upload/files/71193288826.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c49d32a6fceebc34fcad67de414414de/kizifajipufigoxuz.pdfIn PDF document text
- https://resonanceacteurs.nl/userfiles/file/golitiponuka.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kciu7pem2spjjcrko3gsatscsi/47759723892.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5f126de7---dakexofefukuzaxexib.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//malupizomalemidokujejifej.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655d144d93---pikesodeduzinog.pdfIn PDF document text
- http://crm333.com/documentos/file/wujagafukowimuji.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd3623cad---57580841522.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/da292645b0aeea23312b02a68a2067b7/vurebujitasefaju.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20b926ae---migig.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160924fa81833a---sikuvimikipigebowux.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788d1b60174---pakekajunu.pdfIn PDF document text
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4fa7445d7f477804ae5f6741fe9cd18c/kosojazafonufijopo.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_off0000ebc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC7	16332 bytes
SHA-256: `27824a91a23d6a50db93f75180386ab770541acde053e450311f94ad5f857f10`
`font_01_sfnt_off00011629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11629	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E40	10788 bytes
SHA-256: `46e68b97194de4b02d72f81c28538bae446ead50c75e3d5614b90b4af82380c0`

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