PDF malware analysis — malicious · 5d90f4425dc80330

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 05:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8f823ff3a5c69a5ead5e43e31de8e6be SHA-1: e3608e691c0a30035fa902e3932b07af8580dbe8 SHA-256: 5d90f4425dc803305feb1e057f67ebe341f37ac4116acae0b5e15940a5d3cf75

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggests malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=pc+kinemaster+mod+apk+download PDF link annotation
- http://aodaibooking.com/FileData/ckfinder/files/20210914_E6EC7B71F2EE06F7.pdfIn PDF document text
- http://sonnenheizungen.ch/fckeditor/editor/images/file/4640867783.pdfIn PDF document text
- https://kenhquangcao.vn/uploads/files/xosipigixudavite.pdfIn PDF document text
- https://buzascsaba.hu/userFiles/file/74822563582.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/diwoderijusukavutasomiduf.pdfIn PDF document text
- http://aaz.sk/editor_uploads/files/15047379862.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/vazuwusosud.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d77c1f6f---pekuxaxez.pdfIn PDF document text
- http://jingluo.net/uploadfiles/files/paburerizil.pdfIn PDF document text
- http://langyupharm.com/upload/files/pepidasifovunomikevi.pdfIn PDF document text
- http://qiangka.com/ckfinder/userfiles/files/45556070328.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cf5cd66d---povegibudobozifuvaguzawax.pdfIn PDF document text
- http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/4212158728.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8d819c54425caead22edffea48686a2b/welutazewoki.pdfIn PDF document text
- http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/1451016109.pdfIn PDF document text
- http://ohsongpharm.com/ckfinder/userfiles/files/vazoxulat.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a534beab894830ea2a0b4d9432ce2a64/nelela.pdfIn PDF document text
- https://lexcyberia.com/userfiles/files/46988259187.pdfIn PDF document text
- http://railwaysrailroads.com/upload_files/files/toval.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341696f336f---kisaxepit.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01b36d10d---69204046559.pdfIn PDF document text
- https://mai-avto.ru/upload_files/file/27543935017.pdfIn PDF document text
- http://keyday.ru/files/files/tozisafezulinoluta.pdfIn PDF document text
- http://www.dfdtrading.sk/ckfinder/userfiles/files/92003827319.pdfIn PDF document text
- http://werder-ritter.de/UserFiles/File/dibezomixi.pdfIn PDF document text
- https://4cmedica.com/ficheiros_upload/file/fowelilosotenugem.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_off0000e4ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4ED	17888 bytes
SHA-256: `89dc4aaaa1a8e9eecb7eab95d0e49bf2950dcbdd507f25b39ae8bb39198c8219`
`font_01_sfnt_off0001131e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1131E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012b35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B35	10856 bytes
SHA-256: `de4c037004845eabbb68e40d8c86141901176c9ec7d248a623aab5a9af642319`

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