Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc103dfb7985cbad…

MALICIOUS

PDF

96.9 KB Created: 2021-07-20 06:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8209103017ff5ccb5d1cab4fd8ad94f0 SHA-1: a5ec73f3abc5b93a95e4f59bd73e0e289c1d2f45 SHA-256: fc103dfb7985cbad7d51bed4aca7e6aa4230c2d23f918e8e484a16bbbd9af8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://learnersdigest.org/userfiles/file/gelosuvodatugusogew.pdf In PDF document text
    • http://bygreenpure.com/userfiles/file/viwewojasup.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5efc4c7e1dfdab6aced4d086cede963f/46610149504.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20f79219f5ab5e90c777ae14ff55dde/xosasodeloditojedes.pdfIn PDF document text
    • http://szwygs.com/upload/xafer.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062905152580554.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb5a6cae2f---zuwaturuxinibezixo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6041680fde---wodigejalokevevex.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/lulidutoworikunudixomo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///78394942534.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/90274847012.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8e0c09125ef4c4dd127c0548e32dfd11/xoguxeritilufurap.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/44251602897.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/7833789411.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b152224fb---xoxikiwoxonigofuzanidufu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc353bb4d---gojoresadafumotivat.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/47296221733.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/78457739455.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2f26cc2054e5269f86207087adfe92f0/mojomozozaxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bbc+mrs+brown+waxingPDF 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_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10676 bytes
SHA-256: fcdce212247316687d4dea76eef8a43417d027918e13db8623421acbbb1d43cf
font_01_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 17188 bytes
SHA-256: 63344ee68b24ff7dd7f023eee5b3ceda66a5e9a6f3acc5362732d07e52966e07
font_02_sfnt_off00015eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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