PDF malware analysis — malicious · 3f555370afa36039

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 17:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 89f5eb8d9c84a7b967fc5d19ed2b5b17 SHA-1: 0ff8c1d93805d68b7e7ff0379b2f3d5bc6a47a0b SHA-256: 3f555370afa36039df04648e50a236ced4b1c532d889ccfef5cd2387d4c24921

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://akproauto.com/nbloom/fckuploads/file/18476646261.pdf In PDF document text
- http://hvezda-pardubice.cz/files/file/47385641267.pdfIn PDF document text
- http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/95891959129.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/97693293520.pdfIn PDF document text
- http://brandweeramsterdamamstellanden.nl/userfiles/file/larowakowipuro.pdfIn PDF document text
- http://xpressup.com/userfiles/file/56601290328.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f8535c50a89a9a829c6d52a1d8fe9fdb/faxixuwinilexaku.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/431c447d192fa08f0fefdaff0c6d05b8/67220056156.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3bda85b87eff7739e27ef7217b9d3e18/56286491718.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88c297dfd---59470734669.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf138e1695---11005749182.pdfIn PDF document text
- http://klick-tipp.info/ckfinder/userfiles/publics/files/92784109771.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/thq67j08tq0suf0eacrots42e1/luviwoxadebem.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5357819ab7---47048128067.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3fccc218---90734957287.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/04ddfb41195ca486a23d3dfe4bd30b44/93742660386.pdfIn PDF document text
- https://kientrucqhouse.com/uploads/image/files/gorajafumexopejojepeg.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3i6bcckgh6apu3hsk154gbpbi4/63687527284.pdfIn PDF document text
- http://teakdeck.pl/files/file/vikiluxipuguv.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/69368546564.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609599ed9ec6d---53261100663.pdfIn PDF document text
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d652ca816c---1755700458.pdfIn PDF document text
- http://bolshunoff.ru/images/wysiwyg/file/99659970421.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/safafijokowopifovejujaja.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e39c3ae14bbc7a6936a682a331dca576/fugatodikamobiwafekepe.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098382bc3cc5---30937037736.pdfIn PDF document text
- https://rawoctane.com/uploads/file/xobalewirinujo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=classroom+management+engaging+students+in+learning+pdfPDF 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_off0000e7b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFCD	10972 bytes
SHA-256: `1d6ea2739abeb24f9c3a76514dcd33650722752b7d836b165f47fdafbcefa097`
`font_02_sfnt_off00011907.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11907	17892 bytes
SHA-256: `2fb52795f17176d9a11703ba09899ff4af7b16b5d4cf91b9e9ab0b4229c8fb68`

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