Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce389a79cc27cfa0…

MALICIOUS

PDF

77.3 KB Created: 2021-08-21 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e056046a485a3e0bcdc5ddfcf148378c SHA-1: 866cb7c5919d3423a08df1592e9edeb80a63c527 SHA-256: ce389a79cc27cfa0bfb5354b31ed23c3418ad4a0b54e1dda294b9040612cd6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating a primary purpose of redirecting users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=dinosaurios+para+colorear+con+nombres+pdf PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/votawutokaxowukatu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7l4d4ieb5fm2t7pkdm0s7lllf7/37167909628.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/01018f2d40500ced875c7cad785814cb/64353598359.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/56727331023.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/lolitepegolukebigenogemem.pdfIn PDF document text
    • https://stvorki.ru/files/file/xinivetiveke.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edbad1a8929---42291096348.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9bf2423de---85754890037.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/43044095356.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/dafexoso.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/19482890820.pdfIn PDF document text
    • http://tercovci.cz/files/file/39500655154.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dbb4657e7---30571387702.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/fedutesatinozugugowisi.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/guwaxezojaliw.pdfIn PDF document text
    • https://peterdegendt.be/file/88800949132.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6700a7a90b21c9464595c02f6643652b/boseg.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/fujanudafubaxo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/76cc71b5703c11e763a21532bdcbaa90/nikujore.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/24961925518.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7abbc76e3---48757278588.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f6321965---95424930644.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6bd33777fade3a1c2a1b24ad4b12bf6d/lipagagavefijezofab.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/kojukosiv.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/30261804664.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_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16976 bytes
SHA-256: afa9bab887d8632415871024b396885928a637163c40aaa23b1409e75ca20a12
font_02_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 10924 bytes
SHA-256: f8338e85592111d240f4e4067c8d8bff990c27db6fc1b21bbe8f9d0b680b38bc

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