PDF malware analysis — malicious · 31fbea974f6ea91a

MALICIOUS

PDF

85.5 KB Created: 2021-08-20 08:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 6caf1d108330eb477e26d024b53b4f02 SHA-1: 6da5d9abdaa161ef4d43e3501ff9350c9a47fc63 SHA-256: 31fbea974f6ea91a8b7548a3183c28a8779d550148b1f90e2b8d56693fe540f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=lesson+4+extra+practice+dilations+worksheet+answers PDF link annotation
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6769af83---jixefuxerizor.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3f90cc23f92e700731b7e4276e458727/pidonuvugezasomujurom.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/27156945171.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/getopesu.pdfIn PDF document text
- https://szaktel.hu/uploads/file/tiranunikujafi.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/15ae4098c0f6e94b86d5c1a3dcd24cc8/fapagopududedukezonosur.pdfIn PDF document text
- http://www.terresdescaraibes.fr/file/59312140683.pdfIn PDF document text
- http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/41417719366.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/371a97eeb9fa0de262f45238b1f6745d/zopomusowakabilujisefelu.pdfIn PDF document text
- http://kayapaliinsaat.net/file/fubajux.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/dee218c0ace8f79b4c1cdc4975b2afd4/32599159825.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8f36629d42a9d0105bf8ddb86b6d865d/nomolasubozugini.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d9de1fe---83085670325.pdfIn PDF document text
- http://kiszelyugyvediiroda.hu/docs/file/fiwunub.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bb53ba68---vamajepenizozegubapug.pdfIn PDF document text
- http://fusen-es.info/yamituki-n/uploads/files/83221502846.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ea4651e38457bc486f7e58083192fb5/toxuxogaf.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d180ece48---73199405905.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9443491774---61266966283.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/55891357657.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160920d9aa4fc0---noraxonazilif.pdfIn PDF document text
- http://serbanindustrialconstruct.ro/uploads/files/ronimosu.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/739d70cef1e08fc90e0283298bdbb575/notovowu.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a608026f---kanusutoxubusezutumoretob.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d77bea73e39---54062476204.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_off0000e880.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE880	17276 bytes
SHA-256: `8caadc9a50f6f289de76b8253635788f741624d18e211be3c3673f3d793940ce`
`font_01_sfnt_off000115d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115D4	10928 bytes
SHA-256: `aaa1eea72230a61efc8d10204175e3de55c266c87c70a29a3ac17f67623b516d`
`font_02_sfnt_off00012f2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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