PDF malware analysis — malicious · b3c24ebeb95607a3

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 13:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 4bcf14dc3fd5a89521bd00763fe98ff9 SHA-1: 6abdbb171f20c041f763954e1b0ee918e0e1b54a SHA-256: b3c24ebeb95607a36c06b1d80e1f6a077c46a2bcf262e53ff35e80b22ec7a06d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of multiple external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7252864540185efebc43360f278bf53d/35839368518.pdf In PDF document text
- https://motodubai.com/uploaded_images/files/1769602453.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/putusaxojogapu.pdfIn PDF document text
- https://totalmediasolutions.ae/ckfinder/userfiles/files/76712340672.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac751a0f6cc---90715237569.pdfIn PDF document text
- http://etpatatietpatata.com/userfiles/files/datolutepavabuxikudomozu.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/14447984753.pdfIn PDF document text
- https://residenciasanamaro.es/userfiles/files/95555301161.pdfIn PDF document text
- http://rotang.net/userfiles/file/44842243202.pdfIn PDF document text
- https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
- https://burragebrothers.com/demo/jolie/beta/userfiles/files/2810597919.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/klsofg01safdjqf17bslu1ren4/3920510633.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/98963615090.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161032d82cb9a5---82671736244.pdfIn PDF document text
- http://thecrayfamily.com/clients/36408/File/bisevada.pdfIn PDF document text
- https://b7b.reviewz.eu/app/webroot/files/userfiles/files/44815253085.pdfIn PDF document text
- https://thaiahpa.com/flash/files/wefokugimawijizaputixura.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nvbjnshtjfpv3iv2lguauo1v2c/jiseguledopapusuxov.pdfIn PDF document text
- http://sanarina.de/ckfinder/userfiles/files/mutovatokipoz.pdfIn PDF document text
- http://physocare.com/Images_upload/files/10822099770.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b9558c058c02df49f083eeeaad735693/febagijotewemifanufatodaw.pdfIn PDF document text
- http://gps-ambroisie.com/ressource/site-image/files/93679180697.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f9854d81e094e9f5ab6a2a34eafcf060/83371675702.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f667422cc389a8786ef52b79a733e302/60464406182.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/16169875159.pdfIn PDF document text
- https://istanbularicilikfestivali.com/upload/ckfinder/files/65101119849.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=endress+hauser+fmu90+manual+espa%C3%B1olPDF 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_off0000d167.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD167	17580 bytes
SHA-256: `a72419d2df62983dd11a55ecb227d4fbaf176bc8dbe0b1aeb47669c071728d75`
`font_01_sfnt_off0000ff2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF2D	11152 bytes
SHA-256: `d09d7e9f8405ba2c037158c725fc73c46c5506c407c29df6d4fa489d3a5382e8`
`font_02_sfnt_off000118bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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