PDF malware analysis — malicious · daedff952438b0c2

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: bf449ce09c3fb34a052be671ef7e19b6 SHA-1: c9625be1d5cf6fe03cbc53c21dea1be83227f2e8 SHA-256: daedff952438b0c219b63b1f7645e7f5cfc6ef04a28a2bdc15174bf46ab1822a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=imusic+android+app+download PDF link annotation
- http://unityproductions.com/upload/files/41632615861.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/25124902828.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5d75b6a875853344b0cf5e3c0b917070/6993031323.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/40260084435.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/161d64acb3234d1a1a54e2e2907afd3e/83234530885.pdfIn PDF document text
- http://hidramaco.com/files/files/64305452993.pdfIn PDF document text
- http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/badibimezobeboparomeniwu.pdfIn PDF document text
- http://getsolarnj.com/userfiles/file/39062518496.pdfIn PDF document text
- http://netcentricnj.com/ckfinder/userfiles/files/67566106305.pdfIn PDF document text
- http://mnwebdesign.dk/userfiles/file/6215820118.pdfIn PDF document text
- http://cesishotel.com/res/wysiwyg/file/63550585357.pdfIn PDF document text
- https://weddingitaly.jp/images/file/57345324627.pdfIn PDF document text
- https://duhocblueocean.vn/ckfinder/userfiles/files/17608797657.pdfIn PDF document text
- http://dcbestwings.com/uploads/files/23102734902.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0003f3771---82147445371.pdfIn PDF document text
- http://jmk.kr/ckfinder/userfiles/files/xobaxetijosilukadomub.pdfIn PDF document text
- http://tacchigroup.com/public/thread/risorse/file/21904099530.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/damowobip.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af834e87a---18599134096.pdfIn PDF document text
- http://daugiavanthienphuoc.com/media/ftp/file/46130878610.pdfIn PDF document text
- https://dveropolis.ru/upload_picture/92383157888.pdfIn PDF document text
- https://aqua2go.pl/galeria/file/7215396618.pdfIn PDF document text
- http://boki.hu/editor_up/25818251572.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161322e2e075f3---91536514702.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_off0000bab6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAB6	10584 bytes
SHA-256: `a12ed590c3b534bd3ab897271de3be1693251738caf40d3aecd9c7e15bf543dd`
`font_01_sfnt_off0000d2d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2D4	16644 bytes
SHA-256: `01d72d4819738a7d82a1b94b13013bf7935e5b576852a63a9ad4c2dc2b7186be`
`font_02_sfnt_off0000fd08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD08	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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