Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37bd84547a511a4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 13:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a71ec81534478b2dbe5eccdfffca1da2 SHA-1: 3d28ff7a25523b93888e63e94dbadb542477636b SHA-256: e37bd84547a511a402f879928b1f879c12f7d1eeb8913ef29fc973cc926f52a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to lure users into clicking, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b5cacf04ba3623879c0af2776568bc3/58599562407.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/keburiwirizuradikokabura.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/62803243194.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051311494773499.pdfIn PDF document text
    • https://bak.vn/upload/files/21640584646.pdfIn PDF document text
    • http://billsky.ee/files/file/momoridudeloj.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/xibikemuzalokidax.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7513ceab---27254859816.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f80dbaee---3514874281.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/94336976908.pdfIn PDF document text
    • https://kimcert.net/E/file/jufufatawemuwa.pdfIn PDF document text
    • https://samowar.ch/upload/file/tepidu.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/12631668267.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/rakesebijubolujiguzu.pdfIn PDF document text
    • http://52963566.com/upload/file/202108270456261858.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/egclnsrjcbbkt7cpmp9l7j8mn7/lopabafefu.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wikinefirozepi.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/fiminozisusuxova.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/18550276156.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/26573274699.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/rixosoxutopuse.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a694335e0b1---guxovadufawegojapube.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/76907827485.pdfIn PDF document text
    • http://belloverde.net/emailer/file/xuguxutijezud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=important+programs+in+c+pdfPDF 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_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16576 bytes
SHA-256: edb91eedc0b63df281a1bdc6041ddb2b3d1c7c6f404a793ffffefde4b2e0d770
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10736 bytes
SHA-256: 22ae7fa4f6079627bfdd15b1a9aff9e970004dae9ef7c7bacf9e3161f3deb92c

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