PDF malware analysis — malicious · d60c10441e167489

MALICIOUS

PDF

122.0 KB Created: 2021-06-28 07:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 8f7e9ad035c37efa4364374f4c533ee4 SHA-1: 4137b6ab9f8197c437c1c52575c2eb96561b9e4a SHA-256: d60c10441e167489f1790ee19e109cfc6db2366fb2fca3a4e8ef340dba936cf5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other potentially malicious URLs. The presence of numerous external URIs and link farm indicators strongly suggests an intent to redirect users to sites hosting further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

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://chcial.ru/uplcv?utm_term=quotes+about+racism+in+huckleberry+finn PDF link annotation
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072799e52146---mawir.pdfIn PDF document text
- http://palami.by/images/file/307912604.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b437fa0835---24191513370.pdfIn PDF document text
- http://nappsa.org/userfiles/file/wajuzeroxiwuxi.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be97afab3---56985689196.pdfIn PDF document text
- https://living-stone.lu/userfiles/files/wisajirepagegezulorevikax.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/808e9942ddce6b15cadd2301f7cf0b21/kalatopowawe.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/080607c6729675c60865170d6166730e/17845954769.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles//file/zapawezirupaza.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/baxofizemanawadobova.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s7t3gqi7u1bv94eiecvapcn905/xesuxojez.pdfIn PDF document text
- http://monkey-do.net/userfiles/file/13678469513.pdfIn PDF document text
- https://bititechnika.com/uploads/file/luputodikimemut.pdfIn PDF document text
- https://fibaquitaine.fr/cebatrama/userfiles/files/gitinurelogepaniperaze.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pnpntpmftmdf4fglfpvjq9auta/lapit.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/zixamudujanigejijewijazev.pdfIn PDF document text
- http://susutour.com/userfile/file/88729370163.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82c03e325---kuteduvabulomivanapawu.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609845a4304dd---jigajusomoxegujevewubo.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02384deb5---kosemam.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f147fd3b---beroso.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/kuzonukivobodapovakajuxo.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/df49d986369bcbdab921aadca6636c20/33215295058.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c5aaf71f---wonubatemef.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537ba96967---jakajewutavo.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_off00016f58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16F58	2984 bytes
SHA-256: `5023163a499b22cd2e55ced86cfe7ce600b05ae72bbc2247a15191ae26e3f316`
`font_01_sfnt_off00017bcf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17BCF	11108 bytes
SHA-256: `36503193c5a420fa2d3eaf11e44da41930aca952c6de0c98d6d31944aae7bd55`
`font_02_sfnt_off000195a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x195A9	17380 bytes
SHA-256: `dcb3e0807adcffea192814cce3b27985e0133b6fa7190a80487fc581fdc08ccf`
`font_03_sfnt_off0001c2e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C2E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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