Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a48a639eeaa3c3…

MALICIOUS

PDF

88.0 KB Created: 2021-07-28 04:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18bf9d81b54897b4f3fd5e88bea45ff1 SHA-1: 2e6012ec58dc21a61152af3923895b25a671b108 SHA-256: d0a48a639eeaa3c3620394097e114603e4c0d584eda52eba54fe91bf7fb04e48
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 uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://uekekb.ru/!upload/files/wukok.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nja0ibmckv9fqg3e8nuufecpid/jewulunamur.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mafupamelalifusiwug.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/37622809114.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vakozav.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b08d147e813---296793704.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/fogiwinefovapado.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/523626ac9190fe33bcf063cafbe7a633/ditidaseribe.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/70679765313.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b1463dd7---rexefona.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210707033849_880354.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f6b34099---bebibuxegumesebufakul.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/90845009459.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a940e20709---mupapejisufevijesex.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/95835848296.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/29829440227.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/79157378342.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jagagokuxumobuw.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ne53go0j7012qk6ip4fko9d087/544132602.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210720_2A45D2659B329D54.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/24123965344.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c2bd5bfb---32314855204.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/kanabozuwefasoti.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/23410575822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=detailed+lesson+plan+in+adding+and+subtracting+integersPDF 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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 18204 bytes
SHA-256: 37b12eaef624fd4777ae0628f926ce0d4c37a063faa3b7556b75693e079f9c79
font_01_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 10932 bytes
SHA-256: 22556b4aaee01d7bdbf692a50e2c6d9ac51899c953b7722d4afc61f3141f42d0
font_02_sfnt_off000138e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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