Malicious PDF — malware analysis report

Static analysis result for SHA-256 668e28f7622d8a25…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 17:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de30234c1edeaf611d9de9a68a16f8af SHA-1: 44b0303e06a4d0881a22606f6e033debf2a3a541 SHA-256: 668e28f7622d8a25eafb7a285ee67ae4a539df9fa5b36e882cd843b575c30a0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=play+store+apk+download+for+pc+windows+10 PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/567296750dcbae453dc5c8b058264863/zetiwupipinu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614092bb873c3---sixisax.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ff78f07---37109491974.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/javet.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/22078592221.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/dijujawijudujuzamifagak.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/lokaxisezireximo.pdfIn PDF document text
    • https://schmitz.cz/res/file/keboji.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/rafilewefuziziforiweri.pdfIn PDF document text
    • https://upaspor.com/resimler/files/piserono.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/47031243169.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/83312755258.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135313672011---wanatovibako.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/73529823912.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/naveko.pdfIn PDF document text
    • http://kasand.com/userfiles/radajalodi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613101d857b63---39893656603.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/5140768660.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/60910770080.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea41601cf3---vadigopilavupagedupavip.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/10889843207.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/21323112513.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15717498812.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/16479054061.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.

FilenameKindSourceSize
font_00_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 17360 bytes
SHA-256: 6d09e7147f21a6eb00ea75a01fdb720cff07eb388d4e154715ac4e6ad5cbfe2d
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 11080 bytes
SHA-256: fd58b54dc7ce7af1d7c10c70641222e2d90d04f527906d51151064e75453f3cc
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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