Malicious PDF — malware analysis report

Static analysis result for SHA-256 3967bc16abad86d8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 05:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 55787ed6ba317a031d932da90a62471f SHA-1: fba0d7c846e2689ef1b1f8759dac3effd2b6ea06 SHA-256: 3967bc16abad86d8af017178138881f8703927db475ca3b13ae49edea8cb3548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://kstarsmall.net/userfiles/file///vuzegekodezexirin.pdf In PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pepezuxutepabonam.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909110500.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916134800.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15268551041.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/naroronew.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/mamumifajuditifut.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gavepenaregawijes.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/83751939209.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/jenexe.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/64497542444.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/79608806703.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/98717798297.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96222127726.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kijisojufofumezeponov.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e63eb69be---novatixirajovesipidefem.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/56180151596.pdfIn PDF document text
    • https://actorconseil.com/files/file/77524746223.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137747863677---tazenuwu.pdfIn PDF document text
    • http://klpa.net/userData/board/file/69710861643.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/41316179429.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109070809057288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=block+city+wars+pc+free+downloadPDF 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_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 18020 bytes
SHA-256: 026110efe302f091228b363a06b8a44d3e704dbca69342d66cbc973739df252b
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10956 bytes
SHA-256: 8ac53a763aff965bbef2689d4457db44ba20cc4b7bc95b349ec7f5d7d05f40dc
font_02_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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