Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a9e1635558537…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 04:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e2486e102c685f1ffbf50663b32d5ac SHA-1: 32d1acac1407dfe4f3e12fb5bfe7f5a95b7d9d89 SHA-256: 3f8a9e1635558537640cbd3ca9d5887cbf4e46f2060dedc051be6e7ef29bc869
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple external URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. The embedded URLs and link farm structure suggest an attempt to distribute malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ufnk.fr/app/webroot/files/file/kadotugubekuvigug.pdf In PDF document text
    • https://flardochform.se/userfiles/file/17172974261.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/zixifeturazowugi.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/nurizositegubirakil.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8fbad822a5a9f5af7d4fff6ee6795a40/16430527808.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eef0d7c7f40d290517f512d485976705/xibivufosatuzivazuverinu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/67076029605.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc19156b---63221177384.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb32d9ddb---72683740090.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1f69a0c6357b7485ceb69121ea05a55f/dowovoreto.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2842159cd86d1b73350852dabf26eaeb/70403466482.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/purijupuxumorozurelufofe.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c408f269---notagexubusexi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/23672407209.pdfIn PDF document text
    • http://yilip.net/userData/board/file/momejidonatixisaxifoxed.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097870feb085---nexijukese.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8d643163---58363876724.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/56367454380.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd31d5965f---givusurajuwiwife.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/zirasozula.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/fipoxobowok.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b498640d498---24313112200.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/dofajemiwuxanejiwomaf.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7e237380---wudizesekawunavubem.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qpv6g6ejm6d5rri82ep5bcs5hv/93794472539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hide+fox+and+all+afterPDF 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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16976 bytes
SHA-256: cb47dd61fad23a46de41765d74de3840520e331230f387f855581bb5ee66bec0
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 10272 bytes
SHA-256: 928fb1a3d31a7f661871886b1c03b038a860c9a57ebe60d6e030553a681b5184

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