PDF malware analysis — malicious · 4f965b01adebef03

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 04:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a037680725d391ee3867e72796ff3678 SHA-1: b988b0ac19d141f57f1f8d0db134e88ef8b08b37 SHA-256: 4f965b01adebef03522a7b325a3cf0dc4548fd23fffcbb85a0bf5429cebecbe3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=family+and+friends+grade+3+special+edition+pdf PDF link annotation
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753d61df74b---kowebuj.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/gawasexavajiwuza.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dffba8a1a---33860954395.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/64f613889a80de2c5f5ac16f308b8163/bopavovefijeserumipiju.pdfIn PDF document text
- https://ajitcoatings.com/uploads/jedutijolakune.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098baad6bc71---wazotawufixefemujamer.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/22793823428.pdfIn PDF document text
- https://immobiliareincentro.it/allegati/file/51947349615.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mjmlo2dd6cf80ig01qnb2vvinq/wewege.pdfIn PDF document text
- http://tangiahoang.vn/Images_upload/files/seredorasubefiwodadexazo.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3514f3206---vonujaz.pdfIn PDF document text
- http://bawaconstructions.com/editorData/file/fowigamovewejolitalabowa.pdfIn PDF document text
- http://jgbt.us/pds/userfiles/files/51334800625.pdfIn PDF document text
- http://renovfab-menuiserie.com/userfiles/file/76495191094.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l321ep7nbi03f7jdhe3hksg3kg/dopuranopimewikugikegamov.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/keman.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_off0000d79f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD79F	11228 bytes
SHA-256: `7e102f602c918e6da4afbecc429671778f586efb5679e6de100848124b8e37a5`
`font_01_sfnt_off0000f1b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B6	16984 bytes
SHA-256: `b139b0f2993e690ad207098c510165520d476505830285cf9511811ce09a66a1`
`font_02_sfnt_off00011d85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D85	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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