PDF malware analysis — malicious · 80e48f7fae6aa17c

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 04:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: cae19274c05273e06aa520ae888e93c2 SHA-1: 62e4fa45e1d026badc512be6677d0a37de73d77d SHA-256: 80e48f7fae6aa17c2ce4b2b4d6f120b73f05f396a3c54bd46d2e88ad3ba5232b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a series of redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://gtselect.fr/ckfinder/userfiles/files/xapofonijapavanebo.pdf In PDF document text
- http://podwierzba.eu/ckfinder/userfiles/files/53475260817.pdfIn PDF document text
- https://whitesal.com/data/images/file/4788_20210923095459.pdfIn PDF document text
- http://bingsu.ir/cache/fck_files/file/2785215901.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae6587496---58720450406.pdfIn PDF document text
- https://fengshan-zhennangong.org/upload/ckfinder/files/buposezobe.pdfIn PDF document text
- https://ms2oke.com/contents/files/71361546412.pdfIn PDF document text
- https://umiyawoodworks.com/fckdb/userfiles/file/8532642019.pdfIn PDF document text
- https://tatsolarlight.com/uploads/files/pusuw.pdfIn PDF document text
- https://0800-707-808.com/upload/ckfinder_temp/files/20210915203408.pdfIn PDF document text
- http://salonorganica.ru/upload/files/manosazedujeki.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021092108280473499.pdfIn PDF document text
- http://giprozdraw.ru/ckfinder/userfiles/files/5739160812.pdfIn PDF document text
- http://kielcenoca.pl/files/file/21281607748.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2c906929---zovomozetipoxujo.pdfIn PDF document text
- http://clairerolo.com/userfiles/file/93568787728.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/832a14a0553112633727e71d47d70bda/84129352672.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2iesq2c7c7chpgr5fi6opbm2g8/boweserozegipipuvesemame.pdfIn PDF document text
- https://krossi.ru/images/content/files/49357902119.pdfIn PDF document text
- http://topp.pl/_topp/file/sekosabef.pdfIn PDF document text
- http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/gujusax.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/waketonolex.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/mimuzirasapavi.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/52b9fb10f80e75f2b6cd2d69c3d6efc6/319815338.pdfIn PDF document text
- https://brazilairporttransfers.com/ckfinder/userfiles/files/luzojomoxa.pdfIn PDF document text
- https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/dosixasunoluvugasenes.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=apps+like+pdanetPDF 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_off0000b197.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB197	16708 bytes
SHA-256: `1b46e4ef4fe3262cc44f176c05a0ad051bb7a4b72d00d01664e6f2f993f5a152`
`font_01_sfnt_off0000dbee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF405	10236 bytes
SHA-256: `4032f44b47815aed376aa3d9082618ec37173e43e093bccc02d9fce7e825048c`

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