PDF malware analysis — malicious · af58affee7417913

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 11:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 8c1f16a8748fb720be2e6c93696c4b40 SHA-1: b8a051696491ece27e4997e501c3aa92b1385fb5 SHA-256: af58affee741791396a9a6cdd954c7649580768fc57821d9e1ca937bdc9ea8fe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9762

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://krisoc.ru/uplcv?utm_term=hotstar+premium+mod+apk+for+android+tv PDF link annotation
- http://pecsimutargygaleria.hu/files/file/mewizarovupek.pdfIn PDF document text
- https://haciendaloscipreses.cl/upload/file/91627485973.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewenokemozowipifeti.pdfIn PDF document text
- http://alituncer.net/userfiles/file/27190982498.pdfIn PDF document text
- http://td-mg.ru/uploads/files/mozep.pdfIn PDF document text
- http://mprime.net/ckfinder/userfiles/files/90620551407.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/jetive.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/87e501c48cce24ea33529cee860d412a/zoravafutifi.pdfIn PDF document text
- https://ecohort.info/userfiles/files/41790732256.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c4115720---zupewamiteribeniligogi.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/44625450831.pdfIn PDF document text
- http://zkojicin.cz/userfiles/file/paxipodonerugi.pdfIn PDF document text
- http://infiniti.e-library.tw/uploads/files/39023563291.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe762eff02---xezefavakan.pdfIn PDF document text
- https://pesonabali.dswip.com/ci/userfiles/files/48179359738.pdfIn PDF document text
- http://uco-kampen.com/media/files/9670012760.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6ef39c45---79916681041.pdfIn PDF document text
- https://ritascreation.com/userfiles/file/74436191999.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/79441843714.pdfIn PDF document text
- http://totspotdaynursery.co.uk/ckfinder/userfiles/files/37096511874.pdfIn PDF document text
- https://photopoligrafic.ru/ckfinder/userfiles/files/pigatafibekuverexut.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cd0e72d3591820c8b3a3e9089c78c2f9/napowewetijuxefujotu.pdfIn PDF document text
- https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/81297169769.pdfIn PDF document text
- https://mmgrowersg.com/ckfinder/userfiles/files/40359634754.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f6278f331896e544f4ae5625829a7638/wowamofir.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c215b452324677a9c4b74ba61889fb2/1260221134.pdfIn PDF document text
- https://greenline.bg/userfiles/file/91466552312.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d52b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD52B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED42	10864 bytes
SHA-256: `59a1a93dff3ce7a10cfd992edaf3cfc723a41e1a7981dff057a0b295c721869a`
`font_02_sfnt_off00010654.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10654	1868 bytes
SHA-256: `9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51`
`font_03_sfnt_off00010f07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F07	22940 bytes
SHA-256: `f7425a99b1b31b8f0844257e73f79151d1815a03bb6e36fd2ea0fb87c01b3c3c`

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