PDF malware analysis — malicious · 431e1b362607f003

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 12:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: aefe9052db0261d0089ae7e6203932d4 SHA-1: 150aab9d9c4392eaf2d9a6d60712a579788f057a SHA-256: 431e1b362607f0037cfc363669dcd6a3e050d9ba1b425855a05115acb0f74004

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute malicious files. The embedded URLs, such as http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e43af53b---melisavomibitoxajapodewi.pdf, are likely used to redirect users to these malicious files, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

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.
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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2eb651c9---76459881531.pdf In PDF document text
- http://pnmanagementsolutions.in/uploads/75255218541.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/72939875718.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e43af53b---melisavomibitoxajapodewi.pdfIn PDF document text
- https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/vozetuluxib.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/putis.pdfIn PDF document text
- http://ansing.nl/userfiles/file/87496241912.pdfIn PDF document text
- http://campingwithconvenience.com/files/files/4252768322.pdfIn PDF document text
- http://le-bouquet.be/userfiles/files/gowales.pdfIn PDF document text
- https://cmflower-kkc.com/ckfinder/userfiles/files/19894303357.pdfIn PDF document text
- http://fantacyhandicraft.com/userfiles/file/sukuduvakilerewojipene.pdfIn PDF document text
- http://launensia.cz/ckfinder/userfiles/files/8820440036.pdfIn PDF document text
- https://pianoinprimopianofestival.com/uploads/file/44707752620.pdfIn PDF document text
- http://mastervin.ru/files/file/felixakozewigodu.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
- http://halmar.info/userfiles/file/sudovid.pdfIn PDF document text
- http://autowagon.it/userfiles/files/nubupug.pdfIn PDF document text
- http://stagticket.com/fck_upload/file/jatowajefininesuduti.pdfIn PDF document text
- http://parikshitconstruction.com/uploads/35908686414.pdfIn PDF document text
- http://esllearningbydesign.com/app/webroot/files/file/12261372458.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/md5dmic4hh8am3e4r5dqqelrjr/vujorapusexe.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/gipebeguw.pdfIn PDF document text
- https://gsacademy.ge/uploads/files/71298085901.pdfIn PDF document text
- http://www.biosafety.biz/ckfinder/userfiles/files/sadugojiki.pdfIn PDF document text
- http://smartpaintingplus.com/userfiles/files/domolowazu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=among+us+free+allPDF 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_off0000bc22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC22	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d439.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD439	10448 bytes
SHA-256: `0205f62cf7799836cdefe1e655d22e5c321514daf5e0744eb23f58d5418c01f0`
`font_02_sfnt_off0000ebf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF3	15676 bytes
SHA-256: `3ed35ac9aeabdd0a918a1f21ae4fb546e495be754c76c267a09ebd9da7ee8245`

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