PDF malware analysis — malicious · be18e4b31dc2b5ca

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 11:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 89c94bfb33b75458de1efd51ccd3550f SHA-1: adbf7c73c534c096d2803182f01bdbf2bc68ba0d SHA-256: be18e4b31dc2b5ca8d49545e7c96a244d0f9b2d2e2d19ff71b6a35960695f9ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/wewiwofonajanadegaxibifo.pdf In PDF document text
- https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g44knf60350qi76m63is1apd7v/gituzuvotisaxu.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2a60ed4a6---dowofilete.pdfIn PDF document text
- http://sanmargholidays.com/ckfinder/userfiles/files/vimelovipamunazuzakike.pdfIn PDF document text
- http://annamsaigonlaw.com/upload/files/77918493433.pdfIn PDF document text
- https://bio86.net/fichiers/nuliposerinobupapexux.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de497dca8---76457196210.pdfIn PDF document text
- http://taispacedesign.com/upload/files/ripamelogonewuj.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/zejebemozexagunefowikom.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/18231506694.pdfIn PDF document text
- https://himalmanpower.com/ckfinder/userfiles/files/tuwulelojamemerisubibegag.pdfIn PDF document text
- https://n-tlg.com/files/file/jukupupo.pdfIn PDF document text
- http://se-ty.com/uploads/userfiles/file/90155138526.pdfIn PDF document text
- http://kimhoatra.com/upload/fckimagesfile/38994342902.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/rumasunogobo.pdfIn PDF document text
- https://cardion.dk/gfx/fckimages/file/72593246106.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3dc67e90---suzexepobuxigonabe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=management+skills+for+everyday+life+free+pdfPDF link annotation
- 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_off0000e052.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE052	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF864	17900 bytes
SHA-256: `e9dd627d424be3a43d3f8f267944427b0183a2a727d8cc0873a9382c1d23b446`
`font_02_sfnt_off000126b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126B5	11108 bytes
SHA-256: `85bd224f8869d819fc0ef2eba54fe303968f236dd8e7e53d86bed915c57e8e06`

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