PDF malware analysis — malicious · a5b6d7cfe6522b8c

MALICIOUS

PDF

97.5 KB Created: 2021-09-11 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4889f07bdcd0fd60f67f25f15bdf6e18 SHA-1: 62549c156a6ed305306f23eb293b2faff964d751 SHA-256: a5b6d7cfe6522b8cef0c0dd63190c6d906fa3134093ebc49908e04af384aed83

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a coordinated effort to obscure the true destination. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9890

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qcrdc7uvbnj1c1vpeue0l8c2rm/43767853769.pdf In PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531e90ca3---5569033875.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2da86f670---lanisalikusuxan.pdfIn PDF document text
- http://wasserburg.pl/userfiles/file/betupegepumo.pdfIn PDF document text
- http://vinczeandlaszlo.com/upload/nivifidobelaxidusonaxaviz.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/kavax.pdfIn PDF document text
- https://yodobashi-church.com/64957152245.pdfIn PDF document text
- http://koryosushi.com/uploads/files/wofelabowaxuvuvuroboka.pdfIn PDF document text
- http://tofuyatogo.com/uploads/files/fetanusavof.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/159bfd11eeb10b9ef7cba78e48aceeef/88790526414.pdfIn PDF document text
- http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/68133071935.pdfIn PDF document text
- https://haidangpc.com/contents/files/xagebefowekalimef.pdfIn PDF document text
- http://thamcohoaian.com/webroot/img/files/ledodek.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e0b15c4d6173e24c18bacd557695afcc/magumojidewiruxepefepavug.pdfIn PDF document text
- http://cpghollywood.com/userfiles/files/2831173863.pdfIn PDF document text
- http://sluchatka-shop.cz/files/upload/files/gojatuvewinogizi.pdfIn PDF document text
- https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/45221807099.pdfIn PDF document text
- https://patoman.ro/ckfinder/userfiles/files/vogupomuludal.pdfIn PDF document text
- http://blekinge.boj.se/uploads/userfiles/files/wodororiguvekixolotuse.pdfIn PDF document text
- https://appchecar.com/ckfinder/userfiles/files/gufogasutekupuwarobixe.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367888e0c4f---75632789654.pdfIn PDF document text
- https://www.cascatai.com.br/ckfinder/userfiles/files/98159836993.pdfIn PDF document text
- https://biserica-izvorul-tamaduirii.ro/files/nanetekanupabojef.pdfIn PDF document text
- http://liavanhaeringen.nl/userfiles/files/lejeviwoberapo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=skin+free+fire+apkPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5E2	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_01_sfnt_off0000eddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDDF	10084 bytes
SHA-256: `25dc8402e7413baf9655c74482c277c8c15a34b255b9c5818b1f5b6b8bc499a4`
`font_02_sfnt_off00010469.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10469	16444 bytes
SHA-256: `13f1a03a940816c5214074d326007e958550890fd090edc67a5567a9a82e716f`
`font_03_sfnt_off00011b44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B44	27092 bytes
SHA-256: `4efde6522bf4413bdc3e0ce85ff1b00961ae96c05e7f988957a33b29207bedd8`
`font_04_sfnt_off00015f25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15F25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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