Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0d12aed9b63504…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dd8ab99d471af4f1936e23104ca42ff4 SHA-1: d3b4ec75e59251e7ccb3fed45720aa1d6d09a602 SHA-256: ca0d12aed9b635049cdda3aec230e45f3a29bdf5df45e371be9dd5332a044f1b
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO manipulation or to host phishing/malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4c94168---pinurifix.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/remigusekunexenij.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/ximofenepetojufili.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f88ef188c---foded.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/paguzoxov.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xedumoxumebe.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/45124809123.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/dujafawedares.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/saparasijesinazaziwonit.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312fa30d441---23697817119.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/96188271330.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/85279485382.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac263fc46---numivip.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38293899334.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/sonineba.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/94520987874.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiletaxadukadoferefilubop.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161357c9f222a2---36497367912.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d877671e84fdaf5447f0f0f70201d027/bixorezaronifaj.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/13010620565.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/vefanorofisifegomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=program+do+przycinania+mp3+na+androidaPDF 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16944 bytes
SHA-256: de2ee36c8985c093c2133cba6a6b24c03c375fd4a19a3ab476c9018378abfb7b
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 10760 bytes
SHA-256: 02574d107102f51db7610c0c9067619051cf837da597c73f22925f48f0e1dcad

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