PDF malware analysis — malicious · 0de35e643b33ca58

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 18:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: dcf64816ac7b67c6a5897188ea707e0b SHA-1: e8428df14bde6a9284c84253a47c194168a8fd19 SHA-256: 0de35e643b33ca5813b99f47a60f60ddbeb4dcff459e7812409015d4efa9d584

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate it's likely part of a phishing campaign, potentially using a PDF as an attachment to lure victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=share+mobile+screen+android PDF link annotation
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebcce8dd48---52714712544.pdfIn PDF document text
- https://mlspoland.co/files/file/sikoparisujerokezevel.pdfIn PDF document text
- http://ceskylakros.cz/userfiles/file/82390582162.pdfIn PDF document text
- http://cokhibaosang.com/media/ftp/file/5903855677.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42a8a13---pafivevinakijomabupewe.pdfIn PDF document text
- http://picassogift.com/Uploadfiles/files/tuvezub.pdfIn PDF document text
- https://pinyardim.com/calisma2/files/uploads/6984014575.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/90273089914.pdfIn PDF document text
- http://iqlacpro.vn/emotive/upload/files/51292598455.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/15633102510.pdfIn PDF document text
- http://belst.by/upload/file/rebaxoxipududunoxagobu.pdfIn PDF document text
- https://www.gullyracing.it/admin/ckfinder/userfiles/files/24820497924.pdfIn PDF document text
- http://liveranigioielli.it/userfiles/files/753684120.pdfIn PDF document text
- http://nebovsem.ru/app/webroot/files/files/wevujunesoxaxovefi.pdfIn PDF document text
- http://air-con.ru/upload/files/pukugo.pdfIn PDF document text
- https://maydangson.com/vietkiendo/upload/file/8630975681.pdfIn PDF document text
- http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/rosoruguz.pdfIn PDF document text
- http://infrabud.eu/fckpliki/file/66349824536.pdfIn PDF document text
- https://skywaynepal.com/userfiles/file/1941230705.pdfIn PDF document text
- http://webinaris.blog/ckfinder/userfiles/publics/files/kogusunexezegozokebif.pdfIn PDF document text
- https://maribon.net/app/webroot/files/userfiles/files/46927888286.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a634bf3e51a74018871c9634ff6913f2/17998024907.pdfIn PDF document text
- https://hiddencliff.kr/FileData/ckfinder/files/20210905_3DA957274FB7E939.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d058a435c2---39730974942.pdfIn PDF document text
- http://mid-europe-ex.com/images/blog/file/wifigupikaxetukizelorenuv.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e7b5f19---33769757225.pdfIn PDF document text
- http://elitakhealing.com/ckfinder/userfiles/files/40104423251.pdfIn PDF document text
- http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvupivatefuturoz.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_off0000d9c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1D8	10752 bytes
SHA-256: `bf8e35075d0af688cebaeffa7882b92eb0797adb6a20db322d8e6e4daa155f86`
`font_02_sfnt_off00010a46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A46	16992 bytes
SHA-256: `3c2bf2fbd64e7165b3e517d98168adeb75d282174523072936a1d51984db1295`

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