Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23fc895e0ae3341…

MALICIOUS

PDF

91.0 KB Created: 2021-09-02 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e7296ebcfee17b2b830997ddf567920 SHA-1: 837b70627202fac1283b4b2e0a1ed235f314c33b SHA-256: d23fc895e0ae3341b97c3c144547e09bbe14db5ee7867dfe3d8e5f074e2eb0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate that the primary attack pattern is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://ketchas.ru/uplcv?utm_term=general+data+protection+act PDF link annotation
    • https://aihr-iadh.org/uploads/FCK_files/file/teruxazaruzudonomijegatu.pdfIn PDF document text
    • http://kleiberit.ru/files/file/2487167923.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e18255607fcbd414fb245ac352ad4d4/78129282877.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d1e6ab66---39702603949.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/notodagopomubaganidefupa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe47a0a6a0---35343709731.pdfIn PDF document text
    • http://pk.mo/userfiles/file/duzewasoritufifinegub.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/lofesanujokowupabomavage.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9te8dese4332hq04oeg4s3os23/futalavududorom.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/pumex.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed1cb0a81fbe604a32fbda9d288fd250/46736222380.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/89488046122.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aeae30f8b1---mijetakaxufevopavabazaza.pdfIn PDF document text
    • http://djpress.pl/Image/files/natixiwi.pdfIn PDF document text
    • https://tangente-mag.com/img/file/penena.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dde0a6d00a8---ganekizuronadisix.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/13694539478.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///39770261777.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fv7bbh2tfvejm113dsldcdj2oh/12383747803.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b3d9nr4djrhlf4d5jquilrf317/36974834765.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052817344191.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8928bb533b---veleruwup.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/bimumisa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231f81538f---39474482747.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010fb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FB6 19164 bytes
SHA-256: c7e50fa60caf9d54c6808eb74a4706193579850a053aa47658108cb141ead2b3
font_00_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 17492 bytes
SHA-256: ff2e7e1f53daf95f09693bbdab88d7cb4a9ac60e304f7eba0cbdc9f853b259c7
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 10380 bytes
SHA-256: 02fe5d497032e5e6a375a07a2f688edc08c763f3fed047476c89689c6e1f1a44
font_03_sfnt_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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