PDF malware analysis — malicious · d21c748ee43cf98a

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 00:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4aa580ac023ab8408be25cec8356aad2 SHA-1: 5544f1ef6b2ce13c608ec8f8f2e1b0170b52a1fb SHA-256: d21c748ee43cf98a5d5a0b27af4db8246bc56ad77588fc8c1e323aba2cbd6b5b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/67d5e7edf90bd597513d26352ce0789c/wuwudowuzisidozug.pdf In PDF document text
- http://mojahotels.com/ckfinder/userfiles/files/pinipigesixif.pdfIn PDF document text
- http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/94505218560.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5af1ac4f15---39350427593.pdfIn PDF document text
- https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/16093857197.pdfIn PDF document text
- http://corpusbg.com/files/fck/file/duxasabu.pdfIn PDF document text
- http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/35972697161.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8607b47a5ea3177a8ea5c21b1d6751a5/4866588185.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083843562741---85635742433.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1914bc738e6f679cb9d11cb552efdcce/16004019786.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/99451052547.pdfIn PDF document text
- http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160806789033bb---wekotolasunumurogotifipul.pdfIn PDF document text
- http://divapharma.com/uploaded/file/bimiwojibovijobijubagito.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de94de55e7f---10902582674.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/kexibafawu.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/een6k97erheb4oagr6vnbnik9m/25376419589.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f333998838---bogifoganowipigoxebuz.pdfIn PDF document text
- http://www.bandungmesin.com/file/wezipabadezuxikoruvavoki.pdfIn PDF document text
- http://clingac.com/d/files/86017623449.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
- http://alternatifhirdavat.com/upload/ckfinder/files/xozibowogebumedover.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee606a6b52a6f1ae4efe49ad5977a04f/lewonuravejixunupeg.pdfIn PDF document text
- https://bevelec.com/bevelec/dossierMois/file/latira.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673cd05c2a---64845549023.pdfIn PDF document text
- https://lbk-ingatlan.hu/uploads/file/18909395556.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guided+reading+logPDF 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_off0000d138.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD138	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e94f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE94F	10296 bytes
SHA-256: `6fcc8225c0705cca2dda0c48d34abd99c5fe4b748535392cd1a726815e930448`
`font_02_sfnt_off00010051.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10051	17756 bytes
SHA-256: `d68bf541565b87559496bb8de53bd27025ffd3b36ba7d88a9939ab8605f8468b`

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