PDF malware analysis — malicious · a0b0abb631b7f5b5

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 07:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: dc32a506ce7a1352979d41135f79b8b7 SHA-1: a424e59b9fe6e94b6d970aa5ad5fdcc0de106436 SHA-256: a0b0abb631b7f5b559af1b63fdce6d9b3c4d8d232bb0856cd17219c690158434

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=soil+science+treatise+pdf PDF link annotation
- https://ludifrance.fr/userfiles/file/renimazijiwomefiludubujif.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc10d937ad---71887152024.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78e6a14ccd---6449576622.pdfIn PDF document text
- http://gdgom.com/upload/file/210812212531018196xha5c843gmaj.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/wokomerolawafevuzuno.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdfIn PDF document text
- https://www.corpeverest.com/ckfinder/userfiles/files/89499479783.pdfIn PDF document text
- http://palami.by/images/file/rovivusobugiduralolaze.pdfIn PDF document text
- http://studiolaviano.it/userfiles/files/36506015430.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/visim.pdfIn PDF document text
- https://appfacile.it/file/60150251696.pdfIn PDF document text
- http://auxerretv.com/content/public/file/86516136894.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/40705841889.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/pialte6u4qmjor4i57a3dkf7ne/risulijubavumuwaruda.pdfIn PDF document text
- https://fallsplat.se/file/5538255424.pdfIn PDF document text
- https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/nazadiwidosisugav.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/786e71f8f66a5517d291e707199aad90/xexaxinumuvoke.pdfIn PDF document text
- http://alanurturizm.com/rsm/files/17640502715.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/85465230812.pdfIn PDF document text
- http://pwmtqatar.net/userfiles/file/33293993452.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5dbdac79b45190a89ac5cac39b3bec44/kupuxapolegaruri.pdfIn PDF document text
- http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/71709441451.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108d109a27a7---61811033224.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/3932443247.pdfIn PDF document text
- https://pacpartner.net/images_client//imagesfile/defosoxezusazu.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_off0000dab7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAB7	17432 bytes
SHA-256: `50da82e0bff8b122399115b0c5732b2e93c61a9a225cdee44254e0ecf3404677`
`font_01_sfnt_off000107d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ff0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FF0	10688 bytes
SHA-256: `02c809d60fcb435f8d8af4afe24ccfe019d90112399db3efe159b50a95a224e4`

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