PDF malware analysis — malicious · 4365c028725a1001

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 14:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 209d336758774eea68b1bab8c53031c2 SHA-1: 55ac6d7a942cf9c99e5a1493efe5c979ec5fd028 SHA-256: 4365c028725a10019835eea6ec30beb479f8c31366e882b4b18707d60767f01c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency lures further supports a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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.
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
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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba054660352---84345733948.pdf In PDF document text
- https://gadesign52.com/uploads/files/202108241907066876.pdfIn PDF document text
- http://tumwebthailand.com/ckfinder/userfiles/files/bowug.pdfIn PDF document text
- https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/1052404162.pdfIn PDF document text
- http://peak-experience-japan.com/images/blog//file/33118049222.pdfIn PDF document text
- http://babyindex.nl/images/uploads/mefudagotibosifi.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9cbbf2afa86fae89d489615d41952576/tukikada.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2612378f---8668970178.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fdoh19f0jq96mp1jv814ns1iv2/jibotozoxomi.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e55d081b09adbb2a7ea846e7f3a61231/xusuvexodi.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e5d2a6cdc463c6aa5a8c77a7565a121d/21620390030.pdfIn PDF document text
- http://essentielles-theater.de/UserFiles/File/68982918483.pdfIn PDF document text
- http://associazionemillesogni.it/userfiles/files/62112405432.pdfIn PDF document text
- http://suncitygroup.ir/basefile/suncitygroupir/files/simisurofoxiwexep.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0ce528bf---40518790564.pdfIn PDF document text
- http://mnwebdesign.dk/userfiles/file/riwidetidoxobubilurepuj.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-6/file/vebuxigotuvasaxutelo.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899273e9baa---13042608579.pdfIn PDF document text
- http://urduhadith.org/survey/userfiles/files/wijiku.pdfIn PDF document text
- http://7166867.ru/ckfinder/userfiles/files/puzakumepujezikinoz.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/404389aeb946286cb0b5e7fb28467ac1/35471309771.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/65546451849.pdfIn PDF document text
- https://dobski.pl/userfiles/file/lusoguvabekenelowavomo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=strength+training+pdf+downloadPDF 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://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_off0000c29e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC29E	17848 bytes
SHA-256: `6a9e819656e3e4f594b8b78adaa7da9d2a6e1a9160577142ca60e4675b7c2f74`
`font_01_sfnt_off0000f14a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF14A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010961.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10961	10768 bytes
SHA-256: `a39085ce53d728011da0ca665f5dcaefd22d1b668e8af5185ecf089339d4f217`

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