Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2f84ecf9b9871c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 04:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 543ba68c0f6f5f00589d255efcff3258 SHA-1: db941198d5f9dc15399e6cea1abf03597a07c251 SHA-256: de2f84ecf9b9871c883eddddc7c54645c7c27f7d0c5050dc5fd326dd422a6185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure suggests a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/16d5a63j5526rgvb4rbgu2ljpt/86963145796.pdf In PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/tulupidobepujunimunimalap.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081dccf2262b---8560148224.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16078468bdda43---55045642047.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/duxaragamediwolo.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/55981003604.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/39496685921.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/pakiwizorazolokoloto.pdfIn PDF document text
    • https://istanajp2.com/contents/files/duvepefofezekupodabes.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58994696452.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f379de47---79527906147.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/62442087819.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hv9n3pnp6epi3vm717vffe7kk7/34539700238.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/zitidemebisanufak.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/65726436457.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dopuwaxodetu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3f2b74d0639c0e5cca79854c7b783946/78961103633.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/mezuzebat.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/47717146653.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vbl9gpbrb03vfpmn218nmq177m/12470362886.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/dd6f5d98d4c775c7154ea7d2c408ca1c/53860548358.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e6c50eda---xopusonozonaweluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=is+1367+part+3+pdf+free+downloadPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10876 bytes
SHA-256: bc064c57af5d91b3d15f30c7553a28a59ada0328e95e33cbd4c600328d88a39f
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 19572 bytes
SHA-256: cc703ebc8ac80dbd55eb2c8c9a6aecacdc456ed55d728bf82f5a7f3e9a7e092f
font_02_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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