PDF malware analysis — malicious · 1bea3ba6af0630a1

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 13:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5dff4e1a23c90540a2a7d06e771fafe3 SHA-1: 69b05b780766ff52be0b1d48cd9cf6bf2107a538 SHA-256: 1bea3ba6af0630a1899b699812c4f2c05946a916ccc8bd6a74b1f64dc7a6e1d8

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using link farms to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://ketchas.ru/uplcv?utm_term=ez+money+unlimited+coins+apk PDF link annotation
- http://fashioneducation.ru/userfiles/file/80203765603.pdfIn PDF document text
- https://www.habitat-morvan.fr/ckfinder/userfiles/files/nirajaponagagixejefinevov.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/xuwuferoraxuxosafixif.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/933168d87b5637aa87beaa858133e59a/78821450755.pdfIn PDF document text
- http://canavesiobruno-architetti.it/userfiles/files/kavixax.pdfIn PDF document text
- http://skidubravy.sk/spravca/ckfinder/userfiles/files/mimedogubemesi.pdfIn PDF document text
- http://syntrend.critical.tw/upload/files/kepufeselebudejirasom.pdfIn PDF document text
- http://epwuae.com/userfiles/file/37594568181.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/16028653420.pdfIn PDF document text
- https://kheops-so.fr/ckfinder/userfiles/files/rifatobitibelo.pdfIn PDF document text
- https://stabiactiv.com/userfiles/file/78387341264.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ab20dd5e5ce74b505012ac3e49935f5/fesonapozixa.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/78931294521.pdfIn PDF document text
- https://edinburghpools.com/contents/files/lixirujojesifudukutomuk.pdfIn PDF document text
- http://relaxzenter.com/uploads/files/guzumaregowiko.pdfIn PDF document text
- http://inwallendorf.de/userfiles/file/99413921231.pdfIn PDF document text
- http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/sidubiripexapur.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/51023ff9b3de3595bcc15de6822d7850/fesexazisalu.pdfIn PDF document text
- http://codienlanhtrangia.com/Images_upload/files/gafilalubajuforanet.pdfIn PDF document text
- http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdfIn PDF document text
- http://gyndoktors.de/ckfinder/userfiles/files/81363470334.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210904_F5736518EE3F4E23.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_off0000e1ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1CE	10924 bytes
SHA-256: `c921e415e5264cd129c7a3afac5b0210f83b7661a0b27b70dfdc299d852e77fa`
`font_01_sfnt_off0000fb22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB22	18756 bytes
SHA-256: `7c3d2cb16f757ad55e8f9f2fc9a2afdd5f78b93b66260bb3b6cad5f3240b0ff5`
`font_02_sfnt_off00012b6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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