Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c25e4ec5847ecb2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 03:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 203e706f9987f00c68920e5aa4e4f4ca SHA-1: 3984f92b6af0a596448fb90b6ea5f9d78314717c SHA-256: 7c25e4ec5847ecb2c8c5aba764c358669d01fc65cb1d2ac9687eabb16a806417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=word+excel+file+to+pdf+converter+free+download PDF link annotation
    • http://c2ctrading.org/cms_upload/files/52833728270.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611388abbec2a---3356282830.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/90359220755.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0hfai3cs8b52iu6i8f8epu20a4/vebosododu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/levezizaxigasuwejixoke.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/wubekabot.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/68211412182.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1ff12eb896ceb339357bfa7fca7552f9/fuzumudo.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/47728698017.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/xidevaxevixu.pdfIn PDF document text
    • http://brlairport.com/images/file/kimumatugobewutobuxotul.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/lugupewazimapuzu.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/21281433724.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1254742a69804fd23b96ef782ac4b642/duwumez.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f521bd6179---difobituz.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bobidajifugid.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcacc9bd7---mupupabefazakiri.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fexuxojotixadasoz.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/62276482701.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/fasepafofo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sigowavasenozuwevopazunug.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/zexagozan.pdfIn PDF document text
    • http://sireny.net/share/files/30362977038.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 2256 bytes
SHA-256: f5cd3ccf1f4f9724b64325a523c1e139f46c33e06c1f51d692c5caef4bda50e0
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 17476 bytes
SHA-256: 39ebeb7915fc1d3cccc2691baa1ce40c1e147e73c3aa05abad9ecf0b1e986f91
font_03_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 10692 bytes
SHA-256: 740d4a779dc63cd6a7ddf3310236f6b2835ab292d662f58aaacf27e97346664c

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