Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0c0b35ab6040de…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 00:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca268a0740bf1d88fa0c06788870eab1 SHA-1: 3308590dc290398b3c15321262bbcdfa6090bd1d SHA-256: ca0c0b35ab6040de133aba7aa5f773b1990fcb97eea50c10d362c4b4ec4cb051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729feacf221---kegovamofosuwez.pdf In PDF document text
    • https://ip-pharma.net/data/files/taxetekavekurizuraropi.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/70955729917.pdfIn PDF document text
    • http://irths.com/upload_files/files/91609896746.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/wuboxijav.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdff7180f62cb8b21b1253e1af19698e/gaparamowadimamifagev.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/73878405615.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/bigibudofunojepe.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021082521540298.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/65491846365.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf921939429---33833648197.pdfIn PDF document text
    • http://envigest.cz/upload/file/gibuboriruxune.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd7d0bdab9---77028864370.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0e8d6cbf0129d21367c7f8e749cb94ef/guzijudedoweb.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/27ee7ece90f8be6598280134bd18c529/relupo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3dbe1b034cd9e355acf6d1c995615b58/28936411439.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/57b462898b32c9f031a591c700c6edfb/tumugabaretasijupateguzem.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/20206977838.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/fosegupiwimolavoj.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/32958337925.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/kiluvasemixigumogov.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/89030189059.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/bovinemijowoxoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=irregular+verb+list+pdf+downloadPDF 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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 11016 bytes
SHA-256: bef07c46d06b2ae7eec2fe7de1092656adb3f840eba4c7b6d5fab5633ebb1c6d
font_02_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 22008 bytes
SHA-256: 450f3e58c39374a38edbbc76fe590d35a97a946199e5b6c8329e8ec949449951

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