Malicious PDF — malware analysis report

Static analysis result for SHA-256 3820e557c5df1722…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 18:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c2f0383eb101a973a6c59b58410522a SHA-1: b88120ec8bdc8c5fef42cd14e3f5404f3562d02a SHA-256: 3820e557c5df1722b7bd986bd07ecbfe9dcb255eb19861c1aefb14ea291586c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=gktoday+may+2018+pdf+free+download PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8ec901844fce4cff5a4ef5e4d8972165/73173346248.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/42655655353.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/likaxenurexozepimitene.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaabb410b30---jigavepij.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32baaa82e---48428122878.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3cb64baf---bolinavixomiti.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/nukutukedezuzemiz.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/90090705032.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b81fdc9d5---26494415229.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7ed1ddf9ca881bf0851d26e49a6d7c36/90611748095.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nilesajalozujixalojaxo.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/72429104101.pdfIn PDF document text
    • http://netflor.pl/upload/File/momeresolagidat.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/27674543332.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608878551f892---48149319633.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/binetofokotimituvera.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/83194975759.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ad7e8b3fe7b78cc16ae27b26c995a6db/waxukoxasejokidor.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/16141056910.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/rimiwobebuvabatoparuzepa.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/lafolozagunete.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/japaze.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5994f42021---37975074872.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/46124754598.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 11232 bytes
SHA-256: 09b6a6542a034bc78dd63f46e29276940417d9e6685f5d9e8cda2e7ccd55a8a0
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 17980 bytes
SHA-256: fbc4b077d5da8740284bc94c8c03e4771fbfc09592e7ed4228811a4dbe2d20e8

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