PDF malware analysis — malicious · 50bbfa89a59eeaa3

MALICIOUS

PDF

102.5 KB Created: 2021-08-03 04:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d39d2921ee18d0dd88bb22b05b4ea7ab SHA-1: 2de30eca6a35a78ae31a39cce8556b726471b030 SHA-256: 50bbfa89a59eeaa346a8b2cf6c8dd5edf67ab99773d008efffe9bc756f6276ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

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://cructi.ru/uplcv?utm_term=how+to+valency+of+elements PDF link annotation
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4793acf---tinatezepozanajapijipitim.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b204ca697e4---nudomanukobogedanelumob.pdfIn PDF document text
- http://jinistudy.com/_UploadFile/Images/file/jipabaked.pdfIn PDF document text
- https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rjavhdi3gac88gsjbdacb1r6p0/9763747628.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/vukatezen.pdfIn PDF document text
- http://ippon.lv/uploads/File/4826876948.pdfIn PDF document text
- https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/48b572999610bd6e53dd183bcc8cc128/bunasadufegum.pdfIn PDF document text
- https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/5gsf6n4se1irkaricqrihb34j6/38248094191.pdfIn PDF document text
- http://box8websites.com/ckfinder/userfiles/files/73261055172.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d898ec425---bebitadejixizijatipezisiw.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd2f39b1---11524275345.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5e9caac039f7dd3b17211f76bb9fc941/95850828286.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160f19d528d628---ruluwikujirojerigef.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d795e4443c---wesulegofitewokokopidol.pdfIn PDF document text
- http://cinebuzz.be/uploads/userfiles/files/85491009550.pdfIn PDF document text
- http://healingtown.org/userData/board/file/xuzunulapepumi.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d969d5f282b---pezijunusazipufumakoda.pdfIn PDF document text
- https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/26034662310.pdfIn PDF document text
- http://iphonerepairservice.nl/app/webroot/files/userfiles/files/57832982013.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a4d45028---jupuwipuv.pdfIn PDF document text
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16239072647745.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34f3053db---71000000880.pdfIn PDF document text
- http://rexant.by/upload/editor/files/wisozidi.pdfIn PDF document text
- https://debcopharma.com/userfiles/file/budupumulegotapako.pdfIn PDF document text
- https://geniodelweb.com/file/wesomor.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12153	18392 bytes
SHA-256: `19d9b8f0d1058e7de38f0129bbf2acdfcb55210f4f7f414e932fd35c2b82d832`
`font_01_sfnt_off000151d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x151D2	10564 bytes
SHA-256: `66a2f4b66cb81ea638d079381d8676dc51b49206d16c148cfa899a8393e9794c`
`font_02_sfnt_off000169f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x169F8	1736 bytes
SHA-256: `de0d03ae67846b832e289cf667f76d052a2a39558efea7bb28acd1447d2c09bb`
`font_03_sfnt_off00017242.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17242	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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