Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf279b001af937b4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 11:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 562402a0f03fca2a3a82c241ad3e2510 SHA-1: 6959700c2af72353e22ea9e4add6c002e025f4de SHA-256: cf279b001af937b4ebcf19fcfae70671d4e46a76f6af5d1f1aab41f9336db3d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=rubber+material+selection+guide+pdf PDF link annotation
    • https://ottopianos.nl/files/98480985140.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160969f513de2a---jobif.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bb9e6d92---40380493810.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/875d7ff62f3a948c23a3441ac5ac885a/35876523718.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdf0eddfb---35348480487.pdfIn PDF document text
    • https://nexusmediation.nl/files/giredijaroli.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/tuzunowelelevogar.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/napijujinonudojilewisoru.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/75708119959.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ad6842cfaa52244e36be396a914f2ba1/wukuvizo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae3156ffd---kafogufekadaritulirolakag.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/72561391710.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/56969781027.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9204519615.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/sekemibevedorimawizopimow.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/20849858317.pdfIn PDF document text
    • http://medrea.ru/upload/files/purujufu.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/saponuxevudabonute.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f6e304b0a2e53de73dd483d5d1fbc3cd/71923365933.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/negixowipusenapewab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/352f6f2f2c95fe8796b74897ca4a3663/64254503646.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/kazupuwerexotikelox.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210707_001332.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b1423373---dufemodorobojilisogox.pdfIn PDF document text
    • 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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 11248 bytes
SHA-256: 7450c5ebdcfca08799341dba018e04f07d6a0440b05bdb53f2ceb49df4a10dbf
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 18236 bytes
SHA-256: b31b4a4e603617ef5287f8879b6d80bf75fa5087d4f2fabe9259e0f7231f98e8

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