Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c4f6a893418cf6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 06:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c78ee871dde7e95ffec6bf0f6ba9970 SHA-1: 90a7611ef6607e766cd05345e98026b9db91e4a1 SHA-256: f4c4f6a893418cf6e8edae39218c5dc3b5da0e9e57f5095da49f4b4c2ab75286
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://catamma.ru/uplcv?utm_term=download+omegle+video+chat+app+for+android PDF link annotation
    • http://mytrangroup.com/uploads/userfiles/file/gevepaparejikamod.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/20278985396.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/lasedutiromuso.pdfIn PDF document text
    • http://houselandia.ru/files/tedofituxaza.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/30573611394.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/76454983498.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jakufarixugibasodade.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/muzupukejupanukomig.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/55700141548.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ag6i2gpce6f9dvbqijbud8g6io/dakuno.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pozojawusobesodanek.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/batomudipigad.pdfIn PDF document text
    • https://atl-50.com/files/file/25526913244.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/53041368048.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/44554789125.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/29851078436.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/lajixelisizosig.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/mudikigupur.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/vixosozelizomasef.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ae447195---digawixosomisavolota.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210919213739.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/22f183d0624a94388445cf9a74b5c23a/puwomemefejuwag.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jowoneb.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/sodebupuwebuniza.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da272be55---musirureb.pdfIn PDF document text
    • https://aokman-drive.com/d/files/66303673916.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 17420 bytes
SHA-256: 3302325cc48bd27170b0b5b144f4272377ebf366605c449d2e0ebda0a804967b
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 11052 bytes
SHA-256: 69ccede12e1ae9b5f538f9d53e562aca950ed85c33104d6e8357aae77ac6f849

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