PDF malware analysis — malicious · b5bdb2c4d51fc297

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 14:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c785d8bb75f3f2a69098a6f9dc7798c4 SHA-1: 2b6a1a9f9a96566305512e1f0b7f3f987ad95945 SHA-256: b5bdb2c4d51fc29775e7156c2a57bf02eb98347140acc345511eb68e63c2d297

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm pointing to compromised websites. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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 https://philabc.ru/uplcv?utm_term=organizational+behavior+theories+pdf PDF link annotation
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d95964672cc07c5cdadc95b58dfb7a8e/4250271061.pdfIn PDF document text
- http://snabsz.ru/ckfinder/userfiles/files/57948740095.pdfIn PDF document text
- https://landtop.com/filespath/files/20210903121211.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/nomudaj.pdfIn PDF document text
- https://wecareu.net/ckfinder/userfiles/files/86472935023.pdfIn PDF document text
- https://buddhaart.in/userfiles/file/95026323977.pdfIn PDF document text
- http://airfa.it/userfiles/file/17408078697.pdfIn PDF document text
- https://pmcp-avac.com/files/upload-ckfinder/files/besijuv.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/zetoxewonupizadanuf.pdfIn PDF document text
- http://falconartistmanagement.com/ckfinder/userfiles/files/sovuxejuvokimitur.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613603db61ec7---97726533627.pdfIn PDF document text
- http://innobiztour.com/FileData/ckfinder/files/20210903_3C6E1E2E58BB5BDF.pdfIn PDF document text
- https://edusfera.pl/upload/file/fumorumitimumabe.pdfIn PDF document text
- https://aeternoplanning.com/ckfinder/userfiles/files/lidedilulukowad.pdfIn PDF document text
- http://tctrack.vn/images/newtech/files/22072017745.pdfIn PDF document text
- https://comfort8889.com/upload/files/34751624666.pdfIn PDF document text
- http://aescantabria.es/upload/fckeditor/file///96975185073.pdfIn PDF document text
- http://jinshi66.com/uploadfiles/files/58228180288.pdfIn PDF document text
- https://lyna-garage.com/htdocs/cljr/data/files/31105479647.pdfIn PDF document text
- http://autoservizimensi.it/images/fck/file/pudujo.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210908185839_184335865.pdfIn PDF document text
- https://stomatoloska-ordinacija-rijeka.com/files/sedesasuxagunar.pdfIn PDF document text
- http://ctmmaximoravenna.com/ckfinder/userfiles/files/19761531122.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c0da047---4012665318.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135502479ed3---54372730445.pdfIn PDF document text
- http://galsabino.it/userfiles/files/bumabomufepatejakubiko.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dee23d78038ad30d4a8d3cb2c1c31cf9/26440835051.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_off0000bee6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEE6	11068 bytes
SHA-256: `6355b71ad3d0c2e8c0c93996c51940fcbf815ca692fbab41da2d450c22ec052f`
`font_01_sfnt_off0000d845.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD845	14656 bytes
SHA-256: `3c8b977066a3d86f14ad0cf8fce9ac42148b1741d87e39046b47a90e97a2110e`
`font_02_sfnt_off0000fcd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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