Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0ce684324e2cd2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 11:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63e53748c7acae6109c1ec3fb3f991fc SHA-1: b366eccf80b0c3164323b59f83e33d4788b85152 SHA-256: 0b0ce684324e2cd28c09093769c5a65c4c17ffb092724ecef58865c86774d3bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or link-farming scheme. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=h.g.+wells+time+machine+pdf PDF link annotation
    • https://matteagianotti.ch/userfiles/files/91637466083.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/55481711950.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/24122053867.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/22113218628.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/51333539917.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210811220050857566i1gush.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/gasazaganinozujemegoteb.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/dimisewuba.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c4bc821736d59a7a980f18a486498c1/gipanabefukev.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79fdc70f---50131361114.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/lasiboj.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca9b47a3d---zatuwusaj.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/8304427618.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e24i9c8arl9ov11ek27rrred27/71535530893.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/34338571405.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/91276052797.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/65103607425.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dac7dc9627ba7eb9f87d8eea86bfd5dc/lapax.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89e21272d---56739206042.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/94069428250.pdfIn PDF document text
    • https://unitjaya.com/contents//files/mulubisorefewemekigo.pdfIn PDF document text
    • http://indel.sk/userfiles/file/diwem.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/faa3bfcb3e88beb8a38c6cac925cbe00/votaxo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dfeb1adfc5e---99835511606.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/24780246267.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 18732 bytes
SHA-256: a9fde20ddb8506275ee1b256e7d75133652d7941321295febf6feee7867d429d
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10988 bytes
SHA-256: 6f151376f362e438c93c626aad349134eba03b10c0cb15913496adae61df20dd

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