Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cf9a55bec9da5a…

MALICIOUS

PDF

80.3 KB Created: 2021-08-12 20:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcb26e3a381025ae3575cf6f0fd8d174 SHA-1: 128918a7e5f00463f699cfe9546c1f4bc531884a SHA-256: c6cf9a55bec9da5aeb5163c9f228f9410a2d3fc0286a3657121397bd6c2e6a06
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc724b135---48412941138.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c79e3774b---dakakolu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/19036737414.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/68670322536.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7b798ef5---24692662084.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/39109013695.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/60923379206.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/953285d5057cd88133a478f3b8a55954/nenemezek.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/mivojetadikuko.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tuvol.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/42204264547.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gezatinevalijapuma.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18913b441---lebiretanuwek.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/nulewezolajedenik.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/70589283939.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf08315d4---mejotiximifexigiravi.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/perokidabusorewu.pdfIn PDF document text
    • http://melvin.cz/data/76313445909.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vukubuva.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g34tsockeqjq4036rfatba2kg1/66511042833.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/vavizurajekoret.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/jenipezub.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac57d95dc---kiwugadesafadiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=combinacion+sin+repeticion+ejercicios+resueltosPDF 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 17732 bytes
SHA-256: 6562f3b87ca7933414293b9c1d686d2d53a8b5ddf5ee0152c9563367439a4cb7
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 10936 bytes
SHA-256: 37af527bd06f24057a368129119f4790180de5a3e8b103d0a19cbfa2f45a3dbc

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