PDF malware analysis — malicious · 5bb682b269413faf

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6a1f7c0196ac7a3c614ac5aeb04be97f SHA-1: 6e209c28170596f1d4192a01911b31f445393824 SHA-256: 5bb682b269413faf5610891dc3d52c3071eac10fb1a42e433900301c23e96344

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a secondary payload via the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 7

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.
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://philabc.ru/uplcv?utm_term=gta+5+apk+with+verification PDF link annotation
- https://stancijanegrin.com/UserFiles/files/4006429572.pdfIn PDF document text
- https://niboparis.com/upload/fckeditor/file/1631329552_1.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/xasilanadunogoraka.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614321fc8166b---48291194704.pdfIn PDF document text
- http://classicalgardenstatues.com/uplds/file/2103382580.pdfIn PDF document text
- http://urparitet.ru/admin/ckfinder/userfiles/files/18932686059.pdfIn PDF document text
- https://dichvumoinoi.com/ckfinder/userfiles/files/faliwoxeful.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210911063733370.pdfIn PDF document text
- http://benthanhsgfarm.net/images/uploads/files/38689026361.pdfIn PDF document text
- http://orderkiwicafe.com/uploads/files/22257310457.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/dojusiwapunowevebulemer.pdfIn PDF document text
- https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
- https://safrano.pl/userfiles/file/15002539072.pdfIn PDF document text
- http://phubozena.pl/userfiles/file/1194721896.pdfIn PDF document text
- http://xenangheli.vn/public/files/dugogotunadenovu.pdfIn PDF document text
- http://cabanagarden.hu/editor_up/tanoboxebogogezopawa.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/52447809630.pdfIn PDF document text
- http://oticonshop.com/ckfinder/userfiles/files/jalalajetovebuludazav.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614483fea8d31---64943957966.pdfIn PDF document text
- https://www.nstoplana.rs/ckfinder/userfiles/files/99222911249.pdfIn PDF document text
- https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/119477af2eb00e1d022fbaed1c743ed4/55817006475.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_off0000d273.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD273	18576 bytes
SHA-256: `b9f7c9308d086334ae34806497f541edb47a79a6b1e76f4df52cfe03f803bf7a`
`font_01_sfnt_off00010289.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10289	10780 bytes
SHA-256: `7b71cf7005ef72ed43db8ab6ae8e6a6c90289d1ce9b532ce63493777e4513e01`
`font_02_sfnt_off00011b7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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