PDF malware analysis — malicious · c428c9966f2110c6

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 22:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f0c77a678a28b94ebb2c27f3437a927b SHA-1: 6254126e077fdabf85f5888eb712b0ef517d5226 SHA-256: c428c9966f2110c66c2e0962e827184ffbabb0454802c7179e75665e3aa543f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs and link farms points towards a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://nucamsa.es/userfiles/files/36464662477.pdf In PDF document text
- http://kanchanaspa.com/ckfinder/userfiles/files/53629579209.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/wupuv.pdfIn PDF document text
- http://mid-europe-ex.com/images/blog/file/2397040461.pdfIn PDF document text
- https://shopexpert.com/app/webroot/files/userfiles/files/81924346721.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131905a39e32---99214078276.pdfIn PDF document text
- http://yilbasipromosyonu.com/userfiles/file/mubojukebumuj.pdfIn PDF document text
- https://floridahouselottery.com/test/userfiles/file/jerilatafiwame.pdfIn PDF document text
- https://highfieldhousehotel.net/nbloom/fckuploads/file/70786332198.pdfIn PDF document text
- https://sofanet.ro/ckfinder/userfiles/files/jusedanotufu.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/90ed87bee0f7239632aba0904af9d16d/folorasefamaxojakafimuve.pdfIn PDF document text
- http://faisaltowel.com/survey/userfiles/files/19496336922.pdfIn PDF document text
- http://sibaco.ru/ckfinder/userfiles/files/palirilarikeg.pdfIn PDF document text
- http://www.moyekolodin.com/files/valipotikajinexamoka.pdfIn PDF document text
- http://masterref.ru/editorfiles/file/lepunomuseguxusaxediwul.pdfIn PDF document text
- http://djk-winkel.de/images/uploads/file/19706703191.pdfIn PDF document text
- http://babyshelter.net/assets/upload/files/batako.pdfIn PDF document text
- https://qfse.co/images/uploaded_files/ckfinder/files/1630869875_0e37b25dad.pdfIn PDF document text
- http://saga.diamonds/uploads/ckfinder/files/79607408734.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2bc55dff0ab77b9cc2312396e02db21/zugekugalamolananolumi.pdfIn PDF document text
- https://galafrica.actstudio.ro/app/webroot/ckupload/files/fudabifezikakadarave.pdfIn PDF document text
- https://liho.cz/UserFiles/File/92557148563.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/41130277404.pdfIn PDF document text
- http://tythb.com/uploadfile/files/peguvefanexunijonarikana.pdfIn PDF document text
- http://mientaytourist.com/uploads/files/pegusuvotagoserijuv.pdfIn PDF document text
- https://indiachristian.org/uploads/files/pixepugosavoral.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=onlog+premium+apk+crackedPDF 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_off0000b698.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB698	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ceaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEAF	10808 bytes
SHA-256: `8dd74ee5bcc435582209564e0b98a59f18bb2d9db8df8ac0bee50d9ac2f256ab`
`font_02_sfnt_off0000e756.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE756	16484 bytes
SHA-256: `7f435169d59945fb8218b548d2eca0e8802e0dea74f1a59a8c38e84660c5072e`

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