PDF malware analysis — malicious · 524953c366f9370a

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6053478d969da0336149baacb2db907b SHA-1: 5c0a65043d41dccc097a0cd61778eb5f41ae202f SHA-256: 524953c366f9370ab89ae16889b0cead79f8664b7fec84801dd0bc91f82bdf56

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=jurassic+world+tamil+full+movie+2018 PDF link annotation
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613181c229587---18911157308.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161360dbd7c259---81661840964.pdfIn PDF document text
- http://beautybybelief.com/admin/images/file/23908255578.pdfIn PDF document text
- http://webinaris.org/ckfinder/userfiles/publics/files/najufegovijas.pdfIn PDF document text
- http://portalinmobiliario24.com/uploades/fckeditorfile/vazet.pdfIn PDF document text
- http://maivietnamesecotati.com/uploads/files/47307995242.pdfIn PDF document text
- http://novafish.it/userfiles/files/jaliximuxe.pdfIn PDF document text
- http://gizmakina.com/depo/sayfaresim/file/gugiziwusalasumarobodo.pdfIn PDF document text
- https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/50140702018.pdfIn PDF document text
- https://crcnueva.naturasoftware.com/uploads/images/files/82226560913.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb13dbfbf---mojerelunodamekawikidu.pdfIn PDF document text
- https://austarpharma.austarchina.com/upload/files/kaxuwolularojumerafi.pdfIn PDF document text
- http://capitaloffice.pl/fotki/file/wexezirelimetifutev.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0a0c109c---21616583307.pdfIn PDF document text
- https://gedayapi.com/userfiles/file/22041729047.pdfIn PDF document text
- https://samsungvrvklima.com/upload/ckfinder/files/kajuvugefikirerevef.pdfIn PDF document text
- http://iwilldoit.ru/uploads/files/files/ditanowazezazatukebogif.pdfIn PDF document text
- https://matricula.netlandschool.cl/files/54234516132.pdfIn PDF document text
- http://mallenmediations.com/mallenmediations/images/userfiles/file/50835559097.pdfIn PDF document text
- http://bamboomfi.com/htdocs/cljr/data/files/54494954326.pdfIn PDF document text
- http://texinpack.com/uploadfile/file///2021091112043948.pdfIn PDF document text
- http://forumts.com/ckfinder/userfiles/files/nuturimedugorenogigironit.pdfIn PDF document text
- http://mishelik.ru/userfiles/file/ligoromafawifana.pdfIn PDF document text
- http://tecnoservizi.com/userfiles/files/topup.pdfIn PDF document text
- http://medwin.kr/userData/board/file/58117927213.pdfIn PDF document text
- http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wiretidedaruvopebitoso.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_off0000cd2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e53e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE53E	17796 bytes
SHA-256: `d6cf18d462c741f622da7743424f0ea1fc835b4afeb45fc1f096147f721e9625`
`font_02_sfnt_off00011394.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11394	11280 bytes
SHA-256: `604b6cdea04946c8cd5b162efed719cf4c0757fbc2f6b109f2f90bd5c098308f`

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