PDF malware analysis — malicious · a6cef2b79913b407

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 16:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d4c5c5cfe0f65d5e11642c16e06900ec SHA-1: 4a06922afabe9f81854402a7f837987daf3d2dc1 SHA-256: a6cef2b79913b40768dd581b79a7351e593b2f015d68e94d100813612aee9b3a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and the nature of the URLs strongly indicate an intent to redirect users to malicious content.

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://floresdeserrezuela.com/aym_image/files/25119423170.pdf In PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2b69bda91bcd988d91f78b376fa16a5d/80170630634.pdfIn PDF document text
- http://ukrainski-rosyjski.pl/userfiles/file/6086474298.pdfIn PDF document text
- http://jowinbio.com/upload/files/202108070852488295.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/b7ab2024bccbbd628be4a3124e0f25ab.pdfIn PDF document text
- http://acecaalcoy.com/userfiles/file/1216647491.pdfIn PDF document text
- http://nbkhjc.com/uploads/202108/file/2108180431454405730hbhna6flf8m.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/woworagujubuxor.pdfIn PDF document text
- http://alt-1c.ru/userfiles/file/bilemutijomu.pdfIn PDF document text
- http://vimar.ua/userfiles/files/69754788310.pdfIn PDF document text
- http://thepokeluau.com/uploads/files/wadasi.pdfIn PDF document text
- http://teleinwestor.com/userfiles/file/2571585404.pdfIn PDF document text
- http://biafrapol.pl/pliki/file/59173294824.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f4ce7b3fe3590cebdea54fc210f25470/81938866011.pdfIn PDF document text
- https://securitegenerale.tn/userfiles/file/31149459888.pdfIn PDF document text
- https://bem-sa.com/img/file/40071981508.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094deb02b5b0---61098959467.pdfIn PDF document text
- http://halmar.info/userfiles/file/85902941756.pdfIn PDF document text
- http://globalroomplus.com/bot/ckfinder/uf/files/78885543716.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e6e98c784817ae7c322ad49bf059e96d/77236524092.pdfIn PDF document text
- http://skupka54.ru/upload/m/zojexuruv.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b62fbe07b---54396736529.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/dexuvofikadarox.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qjv0cih49rg4l5bnepa8bh6boi/48001884598.pdfIn PDF document text
- http://ayurvedicclinic.org/userfiles/file/92075767372.pdfIn PDF document text
- http://immodraft.nrw/images/architekten_agentur_images_/file/joxolukurolores.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=have+you+ever+broken+your+legPDF 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_off0000cc79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC79	16628 bytes
SHA-256: `b692e5d93579a86f03d16f561bc0883ad842801d803c03db5979e527df5d301f`
`font_01_sfnt_off0000f778.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF778	10428 bytes
SHA-256: `b7d15dc5574e344153c60de8efa436ec346465120709a588fb9e39120f49d210`
`font_02_sfnt_off00010f38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F38	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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