PDF malware analysis — malicious · c38bb97bbdf49258

MALICIOUS

PDF

73.6 KB Created: 2021-10-11 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03

MD5: 75a26681779bbea59e5cf8b797b139e5 SHA-1: f6257a47ee458527f4c1daeecbb691f0124d33c4 SHA-256: c38bb97bbdf492581997c3870a924df726716532b818c8ec4b0e93d8c6196f28

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=sin+60+degrees PDF link annotation
- https://argumentua.com/i/file/lexojoravat.pdfIn PDF document text
- http://idealthailand.com/file_media/file_image/file/worezukeziwa.pdfIn PDF document text
- http://newtarrytowndeli.com/uploads/files/79030533904.pdfIn PDF document text
- http://methese.com/upload/files/vawufekulibemo.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bddb07382c---26959809185.pdfIn PDF document text
- https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/9982840264.pdfIn PDF document text
- https://sskundal.com/userfiles/file/foveki.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16158b383a0dff---20896168944.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556cf641a56---tajepazelumufomitopazolo.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146119bbe82e---80035198320.pdfIn PDF document text
- https://webmedcentralplus.com/userfiles/file/46334331866.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d58d2c53---dulipaganilovikotif.pdfIn PDF document text
- http://nguoigiupviec99.com/webroot/img/files/jajesekupapuwoxefonijile.pdfIn PDF document text
- https://greenbins.ca/ckfinder/userfiles/files/90881561587.pdfIn PDF document text
- http://agarimo.com/archivos/archivos/88625899216.pdfIn PDF document text
- http://elvirajogsi.hu/ckfinder/userfiles/files/53346577767.pdfIn PDF document text
- http://ydtmuhendislik.com/ckfinder/userfiles/files/97597567496.pdfIn PDF document text
- http://glassick.com/userfiles/file/kobax.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b03737a5---xosifolabamuginevorived.pdfIn PDF document text
- https://cjsc.se/ckfinder/userfiles/files/49546499919.pdfIn PDF document text
- https://birudongker.com/contents/files/vewubabilopewikirubimobar.pdfIn PDF document text
- https://ristovski.mk/public_html/upload/userfiles/file/6739175930.pdfIn PDF document text
- https://suprastoc.ro/userfiles/file/kivuvibagegugulogepote.pdfIn PDF document text
- http://skinct.com/upload_file/file/Fl202109092050534221.pdfIn PDF document text
- http://hanilkwanla.com/uploads/files/sexaw.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_off0000bdb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDB5	10364 bytes
SHA-256: `e57abbb135a7920f8cf88efac62b5356b26535e6e0126e3de7314b241092df97`
`font_01_sfnt_off0000d4ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ed11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED11	17096 bytes
SHA-256: `be59fe0d4dc8548b405fbf10fb126718c2b339ffaed74c4bb27f38379e6758cb`

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