PDF malware analysis — malicious · 6b01133e09d40b34

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 07:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2924d6adffc660023191760e24a774fa SHA-1: a8c8a62a995f9a6e272bd679043706c511bcb5fc SHA-256: 6b01133e09d40b3492befad24eb99060e9499882cb8b9c3dbe33332e95c208d7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://rulada.by/upload/editor/files/wajuni.pdf In PDF document text
- http://asvpp.fr/pdf/mabulesagalimovubarusozil.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cea6344dd56f90bff95b47508f769522/5718816514.pdfIn PDF document text
- http://plechotice.sk/tmp/file/busojaxetujutox.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/wiribaw.pdfIn PDF document text
- https://szabolcsipeter.com/userfiles/file/vupawezeraxobuwotep.pdfIn PDF document text
- https://mashtalkandil.com/userfiles/file/fudof.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6e61bc44139ad33a9530639aa10f0d77/16873392762.pdfIn PDF document text
- http://ptichile.cl/userfiles/file/44495896627.pdfIn PDF document text
- https://mttrasportisrl.it/dati/upload/file/vixeje.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144fabe23681---92322176008.pdfIn PDF document text
- https://egyseg.eu/ckfinder/userfiles/files/torogemefinudo.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6ce7e36058d4fef399f117d30feb5ffd/96876245187.pdfIn PDF document text
- http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/ludukotox.pdfIn PDF document text
- http://escalierdurire.fr/ckfinder/userfiles/files/jasefusisuda.pdfIn PDF document text
- http://steelbo.com/uploads/admins/u0/files/20210920050532.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/jojewefasik.pdfIn PDF document text
- http://trubaopt.ru/content/file/liboju.pdfIn PDF document text
- https://alhurwallpaper.com/Files/files/vupibanuxegiwiroz.pdfIn PDF document text
- https://ebal.ro/app/webroot/files/userfiles/files/3238930911.pdfIn PDF document text
- http://www.frank-diagn.hu/userfiles/files/96484073783.pdfIn PDF document text
- https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/lisabimu.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c7e32e61---99672424294.pdfIn PDF document text
- http://bangtutrang.com/upload/files/57791958219.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+close+applicationPDF link annotation
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/12a507105a3087423908d8b960450b58/23131963768.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_off0000b5e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5E2	10488 bytes
SHA-256: `4ad5ac9a8af3b44fff4b0dfb62b236402f62989199927c6759c5110ff2735f2b`
`font_01_sfnt_off0000cdd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDD9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e5eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5EB	14576 bytes
SHA-256: `5a6cc6d0e2cb0ecde257b19259ff7b1796565afb6aa31cecaa5cfa42a2944bcd`

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