PDF malware analysis — malicious · 08ff84dfb90d98a9

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 10:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9954f59d9d410f25296d0712c5c8acc5 SHA-1: 59859c619e4eacc764dbf7d92013bc8a5f59beb6 SHA-256: 08ff84dfb90d98a9202a98e4362fcabcf2de9522e60ee7b61f4ec6b06b9eb1e1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://smidgel.ru/uplcv?utm_term=subnautica+below+zero+download+android PDF link annotation
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133317312d18---91889215165.pdfIn PDF document text
- http://swaptoys.org/ckeditor/uploads/files/jilinifexixutopunexodujak.pdfIn PDF document text
- https://khyatiinfotech.biz/ckfinder/userfiles/files/73172163539.pdfIn PDF document text
- http://janjoling.com/public/ckfinder/userfiles/files/rupekavezagufufofof.pdfIn PDF document text
- http://cpgny.com/userfiles/files/xedutivivezeratalu.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/fipusenedafib.pdfIn PDF document text
- http://unseenadventure.com/userfiles/file/6774725724.pdfIn PDF document text
- http://retailpark.bg/uploads/wysiwyg/files/50226514522.pdfIn PDF document text
- https://85097781.com/upload/files/xuwemolomuvekuxasixono.pdfIn PDF document text
- https://best-label.com/upload/files/zugokus.pdfIn PDF document text
- https://escolaalfa.com/userfiles/file/45546197948.pdfIn PDF document text
- https://beautydent.hu/editor_up/66812680974.pdfIn PDF document text
- http://studiotecnicomancini.eu/userfiles/files/sufefanorenavaredisosoku.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vc43aeh2uto0jog2654da5guf3/46406995796.pdfIn PDF document text
- https://gaziemirkentkonseyi.com/upload/files/60108604607.pdfIn PDF document text
- https://anninhsieuthi.online/upload/files/ratixasamatoxadolawexubox.pdfIn PDF document text
- https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jugasadawesevevikaxor.pdfIn PDF document text
- http://mamam.by/upload/File/file/42270882387.pdfIn PDF document text
- http://parilka.by/var/upload/file/patazetevetakidofix.pdfIn PDF document text
- http://suliaok.com/v15/Upload/file/202196938308388.pdfIn PDF document text
- https://szallas-karpatalja.net/upload/72710135738.pdfIn PDF document text
- https://uangraja.com/contents/files/rigajobo.pdfIn PDF document text
- http://chinhsuasolieu.com/media/files/wafaxupaginixodidobag.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/jujunuxubagagunevito.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380feb10d06---82747527682.pdfIn PDF document text
- http://3colorjazz.com/fckeditor/userfiles/image/26538180372.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_off0000be02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE02	10656 bytes
SHA-256: `ecb50cd58e8d978cc72af0bdc20330559d1a56aad2c34a60c3784fee6629b910`
`font_01_sfnt_off0000d6a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6A4	17256 bytes
SHA-256: `23b22beb9c5b179aa526ba9610121a5933cf8df575468caa597a6beaf135d93e`
`font_02_sfnt_off00010368.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10368	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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