Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf4fec9f14318c7…

MALICIOUS

PDF

79.5 KB Created: 2021-10-17 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d245dec37b6f0cb85d3e06a2ee526ba4 SHA-1: c1a12bfc307dfb59da64d1200ef4b84a290345d9 SHA-256: 9cf4fec9f14318c7e405354c326d2d74614544bbfa50c92ddd8590f11ff27856
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://aotwresort.info/ckfinder/userfiles/files/27490418690.pdf In PDF document text
    • http://sabancilojistik.com/userfiles/file/47010821059.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/fivalurijajadiw.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/nozorij.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/41126503435.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/felimuge.pdfIn PDF document text
    • http://umhouses.com/uploads/files/rojanujepekukovina.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66f65659c8cd26535253bf5efd30afac/97246178672.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/riwasotovegejuwamug.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/55944800242.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/78827643511.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/4117746089.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/14953664491.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/vedakerimerumotazubelop.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/saruzilegagas.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8701015b664e29ef2a1b74fc7b5bbc6f/70574361365.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/29542468959.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/warefiramuleze.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/48283841583.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/74685685013.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/29743028197.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bq0aeuodeqsoqisdpmcn8e6oov/99808677183.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///panemevokiweralugisabekuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=certificate+of+compliance+electrical+work+nsw+formPDF 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17400 bytes
SHA-256: 5ceb5c05c7190c8eddf281832042292d6b5903cf600d3936df1b5ab7eae87252
font_02_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 10852 bytes
SHA-256: d5d26d6f3e755c58fac1cdebc85999112f12ab2da4ce2cde86deed36592c8a68