PDF malware analysis — malicious · 44e960be91852ff6

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 11:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e8b4e219e673456b79010e6fcdc5c083 SHA-1: f8316f07504fa75e5ce84beaca25ea727b3fe5cc SHA-256: 44e960be91852ff6d98cbabe82ed295d791410705faaff858830c43073b8de84

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the nature of the links indicate an attempt to lead the user to a compromised resource, likely for further exploitation or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f995e46b8c---4176956778.pdf In PDF document text
- http://amindoost.ir/images/upload/files/89482640612.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/bf87a42ec70586946efbb043e7eb5c66/midobejebotupo.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906d1bd9660---15178990425.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a70984e---pusaletujimuja.pdfIn PDF document text
- http://sabaispa.net/userfiles/file/84997226842.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/af9e01d19a7b704568afe9099e7068fb/bufopivokeziwudaxaxesin.pdfIn PDF document text
- http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/pekopozikatovivolimodu.pdfIn PDF document text
- http://kaiyudachem.com/filespath/files/20210815033503.pdfIn PDF document text
- https://cr2tek.com/userfiles/Proj_Name//files/74117874497.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0aa84b29d---fisuw.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f5741f93---76348064464.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6vhmkfqfjv3fcnvkl0rp00disv/91826848026.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/41577657064.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/merev.pdfIn PDF document text
- https://andana.us/files/files/48039915670.pdfIn PDF document text
- https://h16hr15k-h19hr37urn.com/contents/files/28014732509.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e55ab78c---50095601081.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/vi4tqjp6ensip35ab9cd5q3049/geveserilujujuwiveve.pdfIn PDF document text
- http://djarkitek.com/temp/vinney/HTML/userfiles/file/45985541657.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea23a5029d---5467745101.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160878d6316c53---ratisekimefarazaviwebe.pdfIn PDF document text
- http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/ligevubewavev.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/758b05d80378f0cd0e038d276acb1f53/33425902233.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb54db571---vujopuzalewufawenal.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b44733aab59fc485e0d8bb7c3806af2b/zinakibovomeb.pdfIn PDF document text
- https://mrdak.cc/uploadfile/files/10093451203.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=recorder+karate+1+pdfPDF 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_off0000ee93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE93	17884 bytes
SHA-256: `17fc8b8fef379f29265644efd2e3ad615e97e66c029c357d53c1fb83c82c474e`
`font_01_sfnt_off00011d38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D38	10392 bytes
SHA-256: `0d18bd1e15c43e7684aa8b6456bbf047ff4922a108c790ae8e922cab011cfb2c`
`font_02_sfnt_off000134f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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