PDF malware analysis — malicious · 3c6fee56699e71b5

MALICIOUS

PDF

102.8 KB Created: 2021-07-22 21:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c36260d196ccd4c5abd937ce3a8b273b SHA-1: f107d41d262916e1d472f6bd92908f366ff97650 SHA-256: 3c6fee56699e71b579629db78a8cd39ed1d94258f3661216d8482c2b9d87d8be

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://studiomuraca.eu/userfiles/files/luwujud.pdf In PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731fa552812---79304739171.pdfIn PDF document text
- https://ascinfratech.com/clientprojects/trading/file/sagegobineromixumozesu.pdfIn PDF document text
- https://nestaerospace.com/uploads/file/8827836759.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a28da85a2---wagafepufoz.pdfIn PDF document text
- https://faprosid.com/file/84771662920.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ea060d1b---5332843352.pdfIn PDF document text
- http://austria-ex.com/images/blog//file/fepaxat.pdfIn PDF document text
- https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/11426977.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dbaaa45e53b8f8b1a2fdcccd4e3e8e3e/kipuvagig.pdfIn PDF document text
- https://irrisyst.eu/files/file/53597334526.pdfIn PDF document text
- http://sns.hu/_user/file/kekiresixef.pdfIn PDF document text
- http://classicalgardenfountains.com/uplds/file/76297451794.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc51484ea---fitubipem.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/30e56e938424362f667d9d419444bebd/65078788939.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/87530871172.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/79766791067.pdfIn PDF document text
- http://getvisa.ru/images/File/73461278647.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da386223536---93501960.pdfIn PDF document text
- https://spacio.hk/attachment/file/4811354852.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/xibijukalewiwavowowinim.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/848494e50e3677a9e74c70ba64bb51e5/kulivin.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f0447049---72869084667.pdfIn PDF document text
- http://blissworldbeauty.com/newerac2c/userfiles/file/62551063582.pdfIn PDF document text
- http://barbusci.it/maisUserFile/file/68379667532.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c006ec1d0cb---tazupakefaguva.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5f44eb5f92f6106befa930431f77c0bc/80316363127.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=who+started+the+spoils+systemPDF 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_off0001304f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1304F	16740 bytes
SHA-256: `54077e16baefe090c3a43453a85828be63e6ca610885a8e220c3352a98a529c4`
`font_01_sfnt_off00015bec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15BEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00017403.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17403	10660 bytes
SHA-256: `fffd7585ed689de6751f2418c4282753e4300b49a6277d88125113012f367207`

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